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Config(3)	 Perl Programmers Reference Guide	Config(3)

NAME
       Config - access Perl configuration information

SYNOPSIS
	   use Config;
	   if ($Config{'cc'} =~ /gcc/) {
	       print "built by gcc\n";
	   }

	   use Config qw(myconfig config_sh config_vars);

	   print myconfig();

	   print config_sh();

	   config_vars(qw(osname archname));

DESCRIPTION
       The Config module contains all the information that was
       available to the "Configure" program at Perl build time
       (over 900 values).

       Shell variables from the config.sh file (written by Con
       figure) are stored in the readonly-variable "%Config",
       indexed by their names.

       Values stored in config.sh as 'undef' are returned as
       undefined values.  The perl "exists" function can be used
       to check if a named variable exists.

       myconfig()
	   Returns a textual summary of the major perl configura
	   tion values.	 See also "-V" in the Switches entry in
	   the perlrun manpage.

       config_sh()
	   Returns the entire perl configuration information in
	   the form of the original config.sh shell variable
	   assignment script.

       config_vars(@names)
	   Prints to STDOUT the values of the named configuration
	   variable. Each is printed on a separate line in the
	   form:

	     name='value';

	   Names which are unknown are output as
	   "name='UNKNOWN';".  See also "-V:name" in the Switches
	   entry in the perlrun manpage.

EXAMPLE
       Here's a more sophisticated example of using %Config:

	   use Config;
	   use strict;

	   my %sig_num;
	   my @sig_name;
	   unless($Config{sig_name} && $Config{sig_num}) {
	       die "No sigs?";
	   } else {
	       my @names = split ' ', $Config{sig_name};
	       @sig_num{@names} = split ' ', $Config{sig_num};
	       foreach (@names) {
		   $sig_name[$sig_num{$_}] ||= $_;
	       }
	   }

	   print "signal #17 = $sig_name[17]\n";
	   if ($sig_num{ALRM}) {
	       print "SIGALRM is $sig_num{ALRM}\n";
	   }

WARNING
       Because this information is not stored within the perl
       executable itself it is possible (but unlikely) that the
       information does not relate to the actual perl binary
       which is being used to access it.

       The Config module is installed into the architecture and
       version specific library directory ($Config{installarch
       lib}) and it checks the perl version number when loaded.

       The values stored in config.sh may be either single-quoted
       or double-quoted. Double-quoted strings are handy for
       those cases where you need to include escape sequences in
       the strings. To avoid runtime variable interpolation, any
       "$" and "@" characters are replaced by "\$" and "\@",
       respectively. This isn't foolproof, of course, so don't
       embed "\$" or "\@" in double-quoted strings unless you're
       willing to deal with the consequences. (The slashes will
       end up escaped and the "$" or "@" will trigger variable
       interpolation)

GLOSSARY
       Most "Config" variables are determined by the "Configure"
       script on platforms supported by it (which is most UNIX
       platforms).  Some platforms have custom-made "Config"
       variables, and may thus not have some of the variables
       described below, or may have extraneous variables specific
       to that particular port.	 See the port specific documenta
       tion in such cases.

       _

       ""_a""
	   From Unix.U:

	   This variable defines the extension used for ordinary
	   libraries.  For unix, it is .a.  The . is included.
	   Other possible values include .lib.

       ""_exe""
	   From Unix.U:

	   This variable defines the extension used for exe
	   cutable files.  For unix it is empty.  Other possible
	   values include .exe.

       ""_o""
	   From Unix.U:

	   This variable defines the extension used for object
	   files.  For unix, it is .o.	The . is included.  Other
	   possible values include .obj.

       a

       ""afs""
	   From afs.U:

	   This variable is set to "true" if "AFS" (Andrew File
	   System) is used on the system, "false" otherwise.  It
	   is possible to override this with a hint value or com
	   mand line option, but you'd better know what you are
	   doing.

       ""alignbytes""
	   From alignbytes.U:

	   This variable holds the number of bytes required to
	   align a double-- or a long double when applicable.
	   Usual values are 2, 4 and 8.	 The default is eight,
	   for safety.

       ""ansi2knr""
	   From ansi2knr.U:

	   This variable is set if the user needs to run
	   ansi2knr.  Currently, this is not supported, so we
	   just abort.

       ""aphostname""
	   From d_gethname.U:

	   This variable contains the command which can be used
	   to compute the host name. The command is fully quali
	   fied by its absolute path, to make it safe when used
	   by a process with super-user privileges.

       ""api_revision""
	   From patchlevel.U:

	   The three variables, api_revision, api_version, and
	   api_subversion, specify the version of the oldest perl
	   binary compatible with the present perl.  In a full
	   version string such as 5.6.1, api_revision is the "5".
	   Prior to 5.5.640, the format was a floating point num
	   ber, like 5.00563.

		   F<perl.c>:incpush() and F<lib/lib.pm> will automatically search in

		   $F<sitelib/.>. for older directories back to the limit specified
	   by these api_ variables.  This is only useful if you have a
	   perl library directory tree structured like the default one.
	   See C<INSTALL> for how this works.  The versioned site_perl
	   directory was introduced in 5.005, so that is the lowest
	   possible value.  The version list appropriate for the current
	   system is determined in F<inc_version_list.U>.

		   C<XXX> To do:  Since compatibility can depend on compile time

		   options (such as bincompat, longlong, F<etc.>) it should
	   (perhaps) be set by Configure, but currently it isn't.
	   Currently, we read a hard-wired value from F<patchlevel.h>.
	   Perhaps what we ought to do is take the hard-wired value from
	   F<patchlevel.h> but then modify it if the current Configure
	   options warrant.  F<patchlevel.h> then would use an #ifdef guard.

       ""api_subversion""
	   From patchlevel.U:

	   The three variables, api_revision, api_version, and
	   api_subversion, specify the version of the oldest perl
	   binary compatible with the present perl.  In a full
	   version string such as 5.6.1, api_subversion is the
	   "1".	 See api_revision for full details.

       ""api_version""
	   From patchlevel.U:

	   The three variables, api_revision, api_version, and
	   api_subversion, specify the version of the oldest perl
	   binary compatible with the present perl.  In a full
	   version string such as 5.6.1, api_version is the "6".
	   See api_revision for full details.  As a special case,
	   5.5.0 is rendered in the old-style as 5.005.	 (In the
	   5.005_0x maintenance series, this was the only ver
	   sioned directory in $sitelib.)

       ""api_versionstring""
	   From patchlevel.U:

	   This variable combines api_revision, api_version, and
	   api_subversion in a format such as 5.6.1 (or 5_6_1)
	   suitable for use as a directory name.  This is
	   filesystem dependent.

       ""ar""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the ar pro
	   gram.  After Configure runs, the value is reset to a
	   plain "ar" and is not useful.

       ""archlib""
	   From archlib.U:

	   This variable holds the name of the directory in which
	   the user wants to put architecture-dependent public
	   library files for $package.	It is most often a local
	   directory such as /usr/local/lib.  Programs using this
	   variable must be prepared to deal with filename expan
	   sion.

       ""archlibexp""
	   From archlib.U:

	   This variable is the same as the archlib variable, but
	   is filename expanded at configuration time, for conve
	   nient use.

       ""archname64""
	   From use64bits.U:

	   This variable is used for the 64-bitness part of
	   $archname.

       ""archname""
	   From archname.U:

	   This variable is a short name to characterize the cur
	   rent architecture.  It is used mainly to construct the
	   default archlib.

       ""archobjs""
	   From Unix.U:

	   This variable defines any additional objects that must
	   be linked in with the program on this architecture.
	   On unix, it is usually empty.  It is typically used to
	   include emulations of unix calls or other facilities.
	   For perl on OS/2, for example, this would include
	   os2/os2.obj.

       ""awk""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the awk pro
	   gram.  After Configure runs, the value is reset to a
	   plain "awk" and is not useful.

       b

       ""baserev""
	   From baserev.U:

	   The base revision level of this package, from the
	   .package file.

       ""bash""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""bin""
	   From bin.U:

	   This variable holds the name of the directory in which
	   the user wants to put publicly executable images for
	   the package in question.  It is most often a local
	   directory such as /usr/local/bin. Programs using this
	   variable must be prepared to deal with ~name substitu
	   tion.

       ""bincompat5005""
	   From bincompat5005.U:

	   This variable contains y if this version of Perl
	   should be binary-compatible with Perl 5.005.

       ""binexp""
	   From bin.U:

	   This is the same as the bin variable, but is filename
	   expanded at configuration time, for use in your make
	   files.

       ""bison""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""byacc""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the byacc pro
	   gram.  After Configure runs, the value is reset to a
	   plain "byacc" and is not useful.

       ""byteorder""
	   From byteorder.U:

	   This variable holds the byte order. In the following,
	   larger digits indicate more significance.  The vari
	   able byteorder is either 4321 on a big-endian machine,
	   or 1234 on a little-endian, or 87654321 on a Cray ...
	   or 3412 with weird order !

       c

       ""c""
	   From n.U:

	   This variable contains the \c string if that is what
	   causes the echo command to suppress newline.	 Other
	   wise it is null.  Correct usage is $echo $n "prompt
	   for a question: $c".

       ""castflags""
	   From d_castneg.U:

	   This variable contains a flag that precise difficul
	   ties the compiler has casting odd floating values to
	   unsigned long: 0 = ok 1 = couldn't cast < 0 2 =
	   couldn't cast >= 0x80000000 4 = couldn't cast in argu
	   ment expression list

       ""cat""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the cat pro
	   gram.  After Configure runs, the value is reset to a
	   plain "cat" and is not useful.

       ""cc""
	   From cc.U:

	   This variable holds the name of a command to execute a
	   C compiler which can resolve multiple global refer
	   ences that happen to have the same name.  Usual values
	   are "cc" and "gcc".	Fervent "ANSI" compilers may be
	   called "c89".  "AIX" has xlc.

       ""cccdlflags""
	   From dlsrc.U:

	   This variable contains any special flags that might
	   need to be passed with "cc -c" to compile modules to
	   be used to create a shared library that will be used
	   for dynamic loading.	 For hpux, this should be +z.  It
	   is up to the makefile to use it.

       ""ccdlflags""
	   From dlsrc.U:

	   This variable contains any special flags that might
	   need to be passed to cc to link with a shared library
	   for dynamic loading.	 It is up to the makefile to use
	   it.	For sunos 4.1, it should be empty.

       ""ccflags""
	   From ccflags.U:

	   This variable contains any additional C compiler flags
	   desired by the user.	 It is up to the Makefile to use
	   this.

       ""ccflags_uselargefiles""
	   From uselfs.U:

	   This variable contains the compiler flags needed by
	   large file builds and added to ccflags by hints files.

       ""ccname""
	   From Checkcc.U:

	   This can set either by hints files or by Configure.
	   If using gcc, this is gcc, and if not, usually equal
	   to cc, unimpressive, no?  Some platforms, however,
	   make good use of this by storing the flavor of the C
	   compiler being used here.  For example if using the
	   Sun WorkShop suite, ccname will be "workshop".

       ""ccsymbols""
	   From Cppsym.U:

	   The variable contains the symbols defined by the C
	   compiler alone.  The symbols defined by cpp or by cc
	   when it calls cpp are not in this list, see cppsymbols
	   and cppccsymbols.  The list is a space-separated list
	   of symbol=value tokens.

       ""ccversion""
	   From Checkcc.U:

	   This can set either by hints files or by Configure.
	   If using a (non-gcc) vendor cc, this variable may con
	   tain a version for the compiler.

       ""cf_by""
	   From cf_who.U:

	   Login name of the person who ran the Configure script
	   and answered the questions. This is used to tag both
	   config.sh and config_h.SH.

       ""cf_email""
	   From cf_email.U:

	   Electronic mail address of the person who ran Config
	   ure. This can be used by units that require the user's
	   e-mail, like MailList.U.

       ""cf_time""
	   From cf_who.U:

	   Holds the output of the "date" command when the con
	   figuration file was produced. This is used to tag both
	   config.sh and config_h.SH.

       ""charsize""
	   From charsize.U:

	   This variable contains the value of the "CHARSIZE"
	   symbol, which indicates to the C program how many
	   bytes there are in a character.

       ""chgrp""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""chmod""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""chown""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""clocktype""
	   From d_times.U:

	   This variable holds the type returned by times(). It
	   can be long, or clock_t on "BSD" sites (in which case
	   <sys/types.h> should be included).

       ""comm""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the comm pro
	   gram.  After Configure runs, the value is reset to a
	   plain "comm" and is not useful.

       ""compress""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       C

       ""CONFIGDOTSH""
	   From Oldsyms.U:

	   This is set to "true" in config.sh so that a shell
	   script sourcing config.sh can tell if it has been
	   sourced already.

       ""contains""
	   From contains.U:

	   This variable holds the command to do a grep with a
	   proper return status.  On most sane systems it is sim
	   ply "grep".	On insane systems it is a grep followed
	   by a cat followed by a test.	 This variable is primar
	   ily for the use of other Configure units.

       ""cp""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the cp pro
	   gram.  After Configure runs, the value is reset to a
	   plain "cp" and is not useful.

       ""cpio""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""cpp""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the cpp pro
	   gram.  After Configure runs, the value is reset to a
	   plain "cpp" and is not useful.

       ""cpp_stuff""
	   From cpp_stuff.U:

	   This variable contains an identification of the cate
	   nation mechanism used by the C preprocessor.

       ""cppccsymbols""
	   From Cppsym.U:

	   The variable contains the symbols defined by the C
	   compiler when it calls cpp.	The symbols defined by
	   the cc alone or cpp alone are not in this list, see
	   ccsymbols and cppsymbols.  The list is a space-sepa
	   rated list of symbol=value tokens.

       ""cppflags""
	   From ccflags.U:

	   This variable holds the flags that will be passed to
	   the C pre- processor. It is up to the Makefile to use
	   it.

       ""cpplast""
	   From cppstdin.U:

	   This variable has the same functionality as cppminus,
	   only it applies to cpprun and not cppstdin.

       ""cppminus""
	   From cppstdin.U:

	   This variable contains the second part of the string
	   which will invoke the C preprocessor on the standard
	   input and produce to standard output.  This variable
	   will have the value "-" if cppstdin needs a minus to
	   specify standard input, otherwise the value is "".

       ""cpprun""
	   From cppstdin.U:

	   This variable contains the command which will invoke a
	   C preprocessor on standard input and put the output to
	   stdout. It is guaranteed not to be a wrapper and may
	   be a null string if no preprocessor can be made
	   directly available. This preprocessor might be differ
	   ent from the one used by the C compiler. Don't forget
	   to append cpplast after the preprocessor options.

       ""cppstdin""
	   From cppstdin.U:

	   This variable contains the command which will invoke
	   the C preprocessor on standard input and put the out
	   put to stdout.  It is primarily used by other Config
	   ure units that ask about preprocessor symbols.

       ""cppsymbols""
	   From Cppsym.U:

	   The variable contains the symbols defined by the C
	   preprocessor alone.	The symbols defined by cc or by
	   cc when it calls cpp are not in this list, see ccsym
	   bols and cppccsymbols.  The list is a space-separated
	   list of symbol=value tokens.

       ""crosscompile""
	   From crosscompile.U:

	   This variable conditionally defines the "CROSSCOMPILE"
	   symbol which signifies that the build process is be a
	   cross-compilation.  This is normally set by hints
	   files or from Configure command line.

       ""cryptlib""
	   From d_crypt.U:

	   This variable holds -lcrypt or the path to a
	   libcrypt.a archive if the crypt() function is not
	   defined in the standard C library. It is up to the
	   Makefile to use this.

       ""csh""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the csh pro
	   gram.  After Configure runs, the value is reset to a
	   plain "csh" and is not useful.

       d

       ""d__fwalk""
	   From d__fwalk.U:

	   This variable conditionally defines "HAS__FWALK" if
	   _fwalk() is available to apply a function to all the
	   file handles.

       ""d_access""
	   From d_access.U:

	   This variable conditionally defines "HAS_ACCESS" if
	   the access() system call is available to check for
	   access permissions using real IDs.

       ""d_accessx""
	   From d_accessx.U:

	   This variable conditionally defines the "HAS_ACCESSX"
	   symbol, which indicates to the C program that the
	   accessx() routine is available.

       ""d_alarm""
	   From d_alarm.U:

	   This variable conditionally defines the "HAS_ALARM"
	   symbol, which indicates to the C program that the
	   alarm() routine is available.

       ""d_archlib""
	   From archlib.U:

	   This variable conditionally defines "ARCHLIB" to hold
	   the pathname of architecture-dependent library files
	   for $package.  If $archlib is the same as $privlib,
	   then this is set to undef.

       ""d_atolf""
	   From atolf.U:

	   This variable conditionally defines the "HAS_ATOLF"
	   symbol, which indicates to the C program that the
	   atolf() routine is available.

       ""d_atoll""
	   From atoll.U:

	   This variable conditionally defines the "HAS_ATOLL"
	   symbol, which indicates to the C program that the
	   atoll() routine is available.

       ""d_attribut""
	   From d_attribut.U:

	   This variable conditionally defines "HASATTRIBUTE",
	   which indicates the C compiler can check for function
	   attributes, such as printf formats.

       ""d_bcmp""
	   From d_bcmp.U:

	   This variable conditionally defines the "HAS_BCMP"
	   symbol if the bcmp() routine is available to compare
	   strings.

       ""d_bcopy""
	   From d_bcopy.U:

	   This variable conditionally defines the "HAS_BCOPY"
	   symbol if the bcopy() routine is available to copy
	   strings.

       ""d_bincompat5005""
	   From bincompat5005.U:

	   This variable conditionally defines BINCOMPAT5005 so
	   that embed.h can take special action if this version
	   of Perl should be binary-compatible with Perl 5.005.
	   This is impossible for builds that use features like
	   threads and multiplicity it is always $undef for those
	   versions.

       ""d_bsd""
	   From Guess.U:

	   This symbol conditionally defines the symbol "BSD"
	   when running on a "BSD" system.

       ""d_bsdgetpgrp""
	   From d_getpgrp.U:

	   This variable conditionally defines "USE_BSD_GETPGRP"
	   if getpgrp needs one arguments whereas "USG" one needs
	   none.

       ""d_bsdsetpgrp""
	   From d_setpgrp.U:

	   This variable conditionally defines "USE_BSD_SETPGRP"
	   if setpgrp needs two arguments whereas "USG" one needs
	   none.  See also d_setpgid for a "POSIX" interface.

       ""d_bzero""
	   From d_bzero.U:

	   This variable conditionally defines the "HAS_BZERO"
	   symbol if the bzero() routine is available to set mem
	   ory to 0.

       ""d_casti32""
	   From d_casti32.U:

	   This variable conditionally defines CASTI32, which
	   indicates whether the C compiler can cast large floats
	   to 32-bit ints.

       ""d_castneg""
	   From d_castneg.U:

	   This variable conditionally defines "CASTNEG", which
	   indicates wether the C compiler can cast negative
	   float to unsigned.

       ""d_charvspr""
	   From d_vprintf.U:

	   This variable conditionally defines "CHARVSPRINTF" if
	   this system has vsprintf returning type (char*).  The
	   trend seems to be to declare it as "int vsprintf()".

       ""d_chown""
	   From d_chown.U:

	   This variable conditionally defines the "HAS_CHOWN"
	   symbol, which indicates to the C program that the
	   chown() routine is available.

       ""d_chroot""
	   From d_chroot.U:

	   This variable conditionally defines the "HAS_CHROOT"
	   symbol, which indicates to the C program that the
	   chroot() routine is available.

       ""d_chsize""
	   From d_chsize.U:

	   This variable conditionally defines the "CHSIZE" sym
	   bol, which indicates to the C program that the
	   chsize() routine is available to truncate files.  You
	   might need a -lx to get this routine.

       ""d_closedir""
	   From d_closedir.U:

	   This variable conditionally defines "HAS_CLOSEDIR" if
	   closedir() is available.

       ""d_const""
	   From d_const.U:

	   This variable conditionally defines the "HASCONST"
	   symbol, which indicates to the C program that this C
	   compiler knows about the const type.

       ""d_crypt""
	   From d_crypt.U:

	   This variable conditionally defines the "CRYPT" sym
	   bol, which indicates to the C program that the crypt()
	   routine is available to encrypt passwords and the
	   like.

       ""d_csh""
	   From d_csh.U:

	   This variable conditionally defines the "CSH" symbol,
	   which indicates to the C program that the C-shell
	   exists.

       ""d_cuserid""
	   From d_cuserid.U:

	   This variable conditionally defines the "HAS_CUSERID"
	   symbol, which indicates to the C program that the
	   cuserid() routine is available to get character login
	   names.

       ""d_dbl_dig""
	   From d_dbl_dig.U:

	   This variable conditionally defines d_dbl_dig if this
	   system's header files provide "DBL_DIG", which is the
	   number of significant digits in a double precision
	   number.

       ""d_difftime""
	   From d_difftime.U:

	   This variable conditionally defines the "HAS_DIFFTIME"
	   symbol, which indicates to the C program that the
	   difftime() routine is available.

       ""d_dirnamlen""
	   From i_dirent.U:

	   This variable conditionally defines "DIRNAMLEN", which
	   indicates to the C program that the length of direc
	   tory entry names is provided by a d_namelen field.

       ""d_dlerror""
	   From d_dlerror.U:

	   This variable conditionally defines the "HAS_DLERROR"
	   symbol, which indicates to the C program that the
	   dlerror() routine is available.

       ""d_dlopen""
	   From d_dlopen.U:

	   This variable conditionally defines the "HAS_DLOPEN"
	   symbol, which indicates to the C program that the
	   dlopen() routine is available.

       ""d_dlsymun""
	   From d_dlsymun.U:

	   This variable conditionally defines
	   "DLSYM_NEEDS_UNDERSCORE", which indicates that we need
	   to prepend an underscore to the symbol name before
	   calling dlsym().

       ""d_dosuid""
	   From d_dosuid.U:

	   This variable conditionally defines the symbol
	   "DOSUID", which tells the C program that it should
	   insert setuid emulation code on hosts which have
	   setuid #! scripts disabled.

       ""d_drand48proto""
	   From d_drand48proto.U:

	   This variable conditionally defines the
	   HAS_DRAND48_PROTO symbol, which indicates to the C
	   program that the system provides a prototype for the
	   drand48() function.	Otherwise, it is up to the pro
	   gram to supply one.

       ""d_dup2""
	   From d_dup2.U:

	   This variable conditionally defines HAS_DUP2 if dup2()
	   is available to duplicate file descriptors.

       ""d_eaccess""
	   From d_eaccess.U:

	   This variable conditionally defines the "HAS_EACCESS"
	   symbol, which indicates to the C program that the eac_
	   cess() routine is available.

       ""d_endgrent""
	   From d_endgrent.U:

	   This variable conditionally defines the "HAS_ENDGRENT"
	   symbol, which indicates to the C program that the end_
	   grent() routine is available for sequential access of
	   the group database.

       ""d_endhent""
	   From d_endhent.U:

	   This variable conditionally defines "HAS_ENDHOSTENT"
	   if endhostent() is available to close whatever was
	   being used for host queries.

       ""d_endnent""
	   From d_endnent.U:

	   This variable conditionally defines "HAS_ENDNETENT" if
	   endnetent() is available to close whatever was being
	   used for network queries.

       ""d_endpent""
	   From d_endpent.U:

	   This variable conditionally defines "HAS_ENDPROTOENT"
	   if endprotoent() is available to close whatever was
	   being used for protocol queries.

       ""d_endpwent""
	   From d_endpwent.U:

	   This variable conditionally defines the "HAS_ENDPWENT"
	   symbol, which indicates to the C program that the end_
	   pwent() routine is available for sequential access of
	   the passwd database.

       ""d_endsent""
	   From d_endsent.U:

	   This variable conditionally defines "HAS_ENDSERVENT"
	   if endservent() is available to close whatever was
	   being used for service queries.

       ""d_eofnblk""
	   From nblock_io.U:

	   This variable conditionally defines "EOF_NONBLOCK" if
	   "EOF" can be seen when reading from a non-blocking I/O
	   source.

       ""d_eunice""
	   From Guess.U:

	   This variable conditionally defines the symbols
	   "EUNICE" and "VAX", which alerts the C program that it
	   must deal with ideosyncracies of "VMS".

       ""d_fchmod""
	   From d_fchmod.U:

	   This variable conditionally defines the "HAS_FCHMOD"
	   symbol, which indicates to the C program that the fch_
	   mod() routine is available to change mode of opened
	   files.

       ""d_fchown""
	   From d_fchown.U:

	   This variable conditionally defines the "HAS_FCHOWN"
	   symbol, which indicates to the C program that the
	   fchown() routine is available to change ownership of
	   opened files.

       ""d_fcntl""
	   From d_fcntl.U:

	   This variable conditionally defines the "HAS_FCNTL"
	   symbol, and indicates whether the fcntl() function
	   exists

       ""d_fcntl_can_lock""
	   From d_fcntl_can_lock.U:

	   This variable conditionally defines the
	   "FCNTL_CAN_LOCK" symbol and indicates whether file
	   locking with fcntl() works.

       ""d_fd_macros""
	   From d_fd_set.U:

	   This variable contains the eventual value of the
	   "HAS_FD_MACROS" symbol, which indicates if your C com
	   piler knows about the macros which manipulate an
	   fd_set.

       ""d_fd_set""
	   From d_fd_set.U:

	   This variable contains the eventual value of the
	   "HAS_FD_SET" symbol, which indicates if your C com
	   piler knows about the fd_set typedef.

       ""d_fds_bits""
	   From d_fd_set.U:

	   This variable contains the eventual value of the
	   "HAS_FDS_BITS" symbol, which indicates if your fd_set
	   typedef contains the fds_bits member.  If you have an
	   fd_set typedef, but the dweebs who installed it did a
	   half-fast job and neglected to provide the macros to
	   manipulate an fd_set, "HAS_FDS_BITS" will let us know
	   how to fix the gaffe.

       ""d_fgetpos""
	   From d_fgetpos.U:

	   This variable conditionally defines "HAS_FGETPOS" if
	   fgetpos() is available to get the file position indi
	   cator.

       ""d_flexfnam""
	   From d_flexfnam.U:

	   This variable conditionally defines the "FLEXFILE
	   NAMES" symbol, which indicates that the system sup
	   ports filenames longer than 14 characters.

       ""d_flock""
	   From d_flock.U:

	   This variable conditionally defines "HAS_FLOCK" if
	   flock() is available to do file locking.

       ""d_fork""
	   From d_fork.U:

	   This variable conditionally defines the "HAS_FORK"
	   symbol, which indicates to the C program that the
	   fork() routine is available.

       ""d_fpathconf""
	   From d_pathconf.U:

	   This variable conditionally defines the
	   "HAS_FPATHCONF" symbol, which indicates to the C pro
	   gram that the pathconf() routine is available to
	   determine file-system related limits and options asso
	   ciated with a given open file descriptor.

       ""d_fpos64_t""
	   From d_fpos64_t.U:

	   This symbol will be defined if the C compiler supports
	   fpos64_t.

       ""d_frexpl""
	   From d_frexpl.U:

	   This variable conditionally defines the "HAS_FREXPL"
	   symbol, which indicates to the C program that the
	   frexpl() routine is available.

       ""d_fs_data_s""
	   From d_fs_data_s.U:

	   This variable conditionally defines the
	   "HAS_STRUCT_FS_DATA" symbol, which indicates that the
	   struct fs_data is supported.

       ""d_fseeko""
	   From d_fseeko.U:

	   This variable conditionally defines the "HAS_FSEEKO"
	   symbol, which indicates to the C program that the
	   fseeko() routine is available.

       ""d_fsetpos""
	   From d_fsetpos.U:

	   This variable conditionally defines "HAS_FSETPOS" if
	   fsetpos() is available to set the file position indi
	   cator.

       ""d_fstatfs""
	   From d_fstatfs.U:

	   This variable conditionally defines the "HAS_FSTATFS"
	   symbol, which indicates to the C program that the
	   fstatfs() routine is available.

       ""d_fstatvfs""
	   From d_statvfs.U:

	   This variable conditionally defines the "HAS_FSTATVFS"
	   symbol, which indicates to the C program that the
	   fstatvfs() routine is available.

       ""d_fsync""
	   From d_fsync.U:

	   This variable conditionally defines the "HAS_FSYNC"
	   symbol, which indicates to the C program that the
	   fsync() routine is available.

       ""d_ftello""
	   From d_ftello.U:

	   This variable conditionally defines the "HAS_FTELLO"
	   symbol, which indicates to the C program that the
	   ftello() routine is available.

       ""d_ftime""
	   From d_ftime.U:

	   This variable conditionally defines the "HAS_FTIME"
	   symbol, which indicates that the ftime() routine
	   exists.  The ftime() routine is basically a sub-second
	   accuracy clock.

       ""d_Gconvert""
	   From d_gconvert.U:

	   This variable holds what Gconvert is defined as to
	   convert floating point numbers into strings. It could
	   be "gconvert" or a more "complex" macro emulating
	   gconvert with gcvt() or sprintf.  Possible values are:
	   d_Gconvert="gconvert((x),(n),(t),(b))" d_Gcon
	   vert="gcvt((x),(n),(b))" d_Gcon
	   vert="sprintf((b),%.*g,(n),(x))"

       ""d_getcwd""
	   From d_getcwd.U:

	   This variable conditionally defines the "HAS_GETCWD"
	   symbol, which indicates to the C program that the
	   getcwd() routine is available to get the current work
	   ing directory.

       ""d_getespwnam""
	   From d_getespwnam.U:

	   This variable conditionally defines "HAS_GETESPWNAM"
	   if getespwnam() is available to retrieve enchanced
	   (shadow) password entries by name.

       ""d_getfsstat""
	   From d_getfsstat.U:

	   This variable conditionally defines the "HAS_GETFS
	   STAT" symbol, which indicates to the C program that
	   the getfsstat() routine is available.

       ""d_getgrent""
	   From d_getgrent.U:

	   This variable conditionally defines the "HAS_GETGRENT"
	   symbol, which indicates to the C program that the get_
	   grent() routine is available for sequential access of
	   the group database.

       ""d_getgrps""
	   From d_getgrps.U:

	   This variable conditionally defines the "HAS_GET
	   GROUPS" symbol, which indicates to the C program that
	   the getgroups() routine is available to get the list
	   of process groups.

       ""d_gethbyaddr""
	   From d_gethbyad.U:

	   This variable conditionally defines the "HAS_GETHOST
	   BYADDR" symbol, which indicates to the C program that
	   the gethostbyaddr() routine is available to look up
	   hosts by their "IP" addresses.

       ""d_gethbyname""
	   From d_gethbynm.U:

	   This variable conditionally defines the "HAS_GETHOST
	   BYNAME" symbol, which indicates to the C program that
	   the gethostbyname() routine is available to look up
	   host names in some data base or other.

       ""d_gethent""
	   From d_gethent.U:

	   This variable conditionally defines "HAS_GETHOSTENT"
	   if gethostent() is available to look up host names in
	   some data base or another.

       ""d_gethname""
	   From d_gethname.U:

	   This variable conditionally defines the "HAS_GETHOST
	   NAME" symbol, which indicates to the C program that
	   the gethostname() routine may be used to derive the
	   host name.

       ""d_gethostprotos""
	   From d_gethostprotos.U:

	   This variable conditionally defines the "HAS_GETH
	   OST_PROTOS" symbol, which indicates to the C program
	   that <netdb.h> supplies prototypes for the various
	   gethost*() functions.  See also netdbtype.U for prob
	   ing for various netdb types.

       ""d_getlogin""
	   From d_getlogin.U:

	   This variable conditionally defines the "HAS_GETLOGIN"
	   symbol, which indicates to the C program that the get_
	   login() routine is available to get the login name.

       ""d_getmnt""
	   From d_getmnt.U:

	   This variable conditionally defines the "HAS_GETMNT"
	   symbol, which indicates to the C program that the
	   getmnt() routine is available to retrieve one or more
	   mount info blocks by filename.

       ""d_getmntent""
	   From d_getmntent.U:

	   This variable conditionally defines the "HAS_GETMN
	   TENT" symbol, which indicates to the C program that
	   the getmntent() routine is available to iterate
	   through mounted files to get their mount info.

       ""d_getnbyaddr""
	   From d_getnbyad.U:

	   This variable conditionally defines the "HAS_GETNET
	   BYADDR" symbol, which indicates to the C program that
	   the getnetbyaddr() routine is available to look up
	   networks by their "IP" addresses.

       ""d_getnbyname""
	   From d_getnbynm.U:

	   This variable conditionally defines the "HAS_GETNETBY
	   NAME" symbol, which indicates to the C program that
	   the getnetbyname() routine is available to look up
	   networks by their names.

       ""d_getnent""
	   From d_getnent.U:

	   This variable conditionally defines "HAS_GETNETENT" if
	   getnetent() is available to look up network names in
	   some data base or another.

       ""d_getnetprotos""
	   From d_getnetprotos.U:

	   This variable conditionally defines the "HAS_GET
	   NET_PROTOS" symbol, which indicates to the C program
	   that <netdb.h> supplies prototypes for the various
	   getnet*() functions.	 See also netdbtype.U for probing
	   for various netdb types.

       ""d_getpagsz""
	   From d_getpagsz.U:

	   This variable conditionally defines "HAS_GETPAGESIZE"
	   if getpagesize() is available to get the system page
	   size.

       ""d_getpbyname""
	   From d_getprotby.U:

	   This variable conditionally defines the "HAS_GETPROTO
	   BYNAME" symbol, which indicates to the C program that
	   the getprotobyname() routine is available to look up
	   protocols by their name.

       ""d_getpbynumber""
	   From d_getprotby.U:

	   This variable conditionally defines the "HAS_GETPROTO
	   BYNUMBER" symbol, which indicates to the C program
	   that the getprotobynumber() routine is available to
	   look up protocols by their number.

       ""d_getpent""
	   From d_getpent.U:

	   This variable conditionally defines "HAS_GETPROTOENT"
	   if getprotoent() is available to look up protocols in
	   some data base or another.

       ""d_getpgid""
	   From d_getpgid.U:

	   This variable conditionally defines the "HAS_GETPGID"
	   symbol, which indicates to the C program that the
	   getpgid(pid) function is available to get the process
	   group id.

       ""d_getpgrp2""
	   From d_getpgrp2.U:

	   This variable conditionally defines the HAS_GETPGRP2
	   symbol, which indicates to the C program that the
	   getpgrp2() (as in DG/"UX") routine is available to get
	   the current process group.

       ""d_getpgrp""
	   From d_getpgrp.U:

	   This variable conditionally defines "HAS_GETPGRP" if
	   getpgrp() is available to get the current process
	   group.

       ""d_getppid""
	   From d_getppid.U:

	   This variable conditionally defines the "HAS_GETPPID"
	   symbol, which indicates to the C program that the
	   getppid() routine is available to get the parent pro
	   cess "ID".

       ""d_getprior""
	   From d_getprior.U:

	   This variable conditionally defines "HAS_GETPRIORITY"
	   if getpriority() is available to get a process's pri
	   ority.

       ""d_getprotoprotos""
	   From d_getprotoprotos.U:

	   This variable conditionally defines the "HAS_GET
	   PROTO_PROTOS" symbol, which indicates to the C program
	   that <netdb.h> supplies prototypes for the various
	   getproto*() functions.  See also netdbtype.U for prob
	   ing for various netdb types.

       ""d_getprpwnam""
	   From d_getprpwnam.U:

	   This variable conditionally defines "HAS_GETPRPWNAM"
	   if getprpwnam() is available to retrieve protected
	   (shadow) password entries by name.

       ""d_getpwent""
	   From d_getpwent.U:

	   This variable conditionally defines the "HAS_GETPWENT"
	   symbol, which indicates to the C program that the get_
	   pwent() routine is available for sequential access of
	   the passwd database.

       ""d_getsbyname""
	   From d_getsrvby.U:

	   This variable conditionally defines the "HAS_GET
	   SERVBYNAME" symbol, which indicates to the C program
	   that the getservbyname() routine is available to look
	   up services by their name.

       ""d_getsbyport""
	   From d_getsrvby.U:

	   This variable conditionally defines the "HAS_GET
	   SERVBYPORT" symbol, which indicates to the C program
	   that the getservbyport() routine is available to look
	   up services by their port.

       ""d_getsent""
	   From d_getsent.U:

	   This variable conditionally defines "HAS_GETSERVENT"
	   if getservent() is available to look up network ser
	   vices in some data base or another.

       ""d_getservprotos""
	   From d_getservprotos.U:

	   This variable conditionally defines the "HAS_GET
	   SERV_PROTOS" symbol, which indicates to the C program
	   that <netdb.h> supplies prototypes for the various
	   getserv*() functions.  See also netdbtype.U for prob
	   ing for various netdb types.

       ""d_getspnam""
	   From d_getspnam.U:

	   This variable conditionally defines "HAS_GETSPNAM" if
	   getspnam() is available to retrieve SysV shadow pass
	   word entries by name.

       ""d_gettimeod""
	   From d_ftime.U:

	   This variable conditionally defines the "HAS_GETTIME
	   OFDAY" symbol, which indicates that the gettimeofday()
	   system call exists (to obtain a sub-second accuracy
	   clock). You should probably include <sys/resource.h>.

       ""d_gnulibc""
	   From d_gnulibc.U:

	   Defined if we're dealing with the "GNU" C Library.

       ""d_grpasswd""
	   From i_grp.U:

	   This variable conditionally defines "GRPASSWD", which
	   indicates that struct group in <grp.h> contains
	   gr_passwd.

       ""d_hasmntopt""
	   From d_hasmntopt.U:

	   This variable conditionally defines the "HAS_HASMN
	   TOPT" symbol, which indicates to the C program that
	   the hasmntopt() routine is available to query the
	   mount options of file systems.

       ""d_htonl""
	   From d_htonl.U:

	   This variable conditionally defines "HAS_HTONL" if
	   htonl() and its friends are available to do network
	   order byte swapping.

       ""d_iconv""
	   From d_iconv.U:

	   This variable conditionally defines the "HAS_ICONV"
	   symbol, which indicates to the C program that the
	   iconv() routine is available.

       ""d_index""
	   From d_strchr.U:

	   This variable conditionally defines "HAS_INDEX" if
	   index() and rindex() are available for string search
	   ing.

       ""d_inetaton""
	   From d_inetaton.U:

	   This variable conditionally defines the
	   "HAS_INET_ATON" symbol, which indicates to the C pro
	   gram that the inet_aton() function is available to
	   parse "IP" address "dotted-quad" strings.

       ""d_int64_t""
	   From d_int64_t.U:

	   This symbol will be defined if the C compiler supports
	   int64_t.

       ""d_isascii""
	   From d_isascii.U:

	   This variable conditionally defines the "HAS_ISASCII"
	   constant, which indicates to the C program that isas_
	   cii() is available.

       ""d_isnan""
	   From d_isnan.U:

	   This variable conditionally defines the "HAS_ISNAN"
	   symbol, which indicates to the C program that the
	   isnan() routine is available.

       ""d_isnanl""
	   From d_isnanl.U:

	   This variable conditionally defines the "HAS_ISNANL"
	   symbol, which indicates to the C program that the
	   isnanl() routine is available.

       ""d_killpg""
	   From d_killpg.U:

	   This variable conditionally defines the "HAS_KILLPG"
	   symbol, which indicates to the C program that the
	   killpg() routine is available to kill process groups.

       ""d_lchown""
	   From d_lchown.U:

	   This variable conditionally defines the "HAS_LCHOWN"
	   symbol, which indicates to the C program that the
	   lchown() routine is available to operate on a symbolic
	   link (instead of following the link).

       ""d_ldbl_dig""
	   From d_ldbl_dig.U:

	   This variable conditionally defines d_ldbl_dig if this
	   system's header files provide "LDBL_DIG", which is the
	   number of significant digits in a long double preci
	   sion number.

       ""d_link""
	   From d_link.U:

	   This variable conditionally defines "HAS_LINK" if
	   link() is available to create hard links.

       ""d_locconv""
	   From d_locconv.U:

	   This variable conditionally defines "HAS_LOCALECONV"
	   if localeconv() is available for numeric and monetary
	   formatting conventions.

       ""d_lockf""
	   From d_lockf.U:

	   This variable conditionally defines "HAS_LOCKF" if
	   lockf() is available to do file locking.

       ""d_longdbl""
	   From d_longdbl.U:

	   This variable conditionally defines "HAS_LONG_DOUBLE"
	   if the long double type is supported.

       ""d_longlong""
	   From d_longlong.U:

	   This variable conditionally defines "HAS_LONG_LONG" if
	   the long long type is supported.

       ""d_lseekproto""
	   From d_lseekproto.U:

	   This variable conditionally defines the
	   "HAS_LSEEK_PROTO" symbol, which indicates to the C
	   program that the system provides a prototype for the
	   lseek() function.  Otherwise, it is up to the program
	   to supply one.

       ""d_lstat""
	   From d_lstat.U:

	   This variable conditionally defines "HAS_LSTAT" if
	   lstat() is available to do file stats on symbolic
	   links.

       ""d_madvise""
	   From d_madvise.U:

	   This variable conditionally defines "HAS_MADVISE" if
	   madvise() is available to map a file into memory.

       ""d_mblen""
	   From d_mblen.U:

	   This variable conditionally defines the "HAS_MBLEN"
	   symbol, which indicates to the C program that the
	   mblen() routine is available to find the number of
	   bytes in a multibye character.

       ""d_mbstowcs""
	   From d_mbstowcs.U:

	   This variable conditionally defines the "HAS_MBSTOWCS"
	   symbol, which indicates to the C program that the
	   mbstowcs() routine is available to convert a multibyte
	   string into a wide character string.

       ""d_mbtowc""
	   From d_mbtowc.U:

	   This variable conditionally defines the "HAS_MBTOWC"
	   symbol, which indicates to the C program that the
	   mbtowc() routine is available to convert multibyte to
	   a wide character.

       ""d_memchr""
	   From d_memchr.U:

	   This variable conditionally defines the "HAS_MEMCHR"
	   symbol, which indicates to the C program that the mem_
	   chr() routine is available to locate characters within
	   a C string.

       ""d_memcmp""
	   From d_memcmp.U:

	   This variable conditionally defines the "HAS_MEMCMP"
	   symbol, which indicates to the C program that the mem_
	   cmp() routine is available to compare blocks of mem
	   ory.

       ""d_memcpy""
	   From d_memcpy.U:

	   This variable conditionally defines the "HAS_MEMCPY"
	   symbol, which indicates to the C program that the mem_
	   cpy() routine is available to copy blocks of memory.

       ""d_memmove""
	   From d_memmove.U:

	   This variable conditionally defines the "HAS_MEMMOVE"
	   symbol, which indicates to the C program that the mem_
	   move() routine is available to copy potentatially
	   overlapping blocks of memory.

       ""d_memset""
	   From d_memset.U:

	   This variable conditionally defines the "HAS_MEMSET"
	   symbol, which indicates to the C program that the mem_
	   set() routine is available to set blocks of memory.

       ""d_mkdir""
	   From d_mkdir.U:

	   This variable conditionally defines the "HAS_MKDIR"
	   symbol, which indicates to the C program that the
	   mkdir() routine is available to create directories..

       ""d_mkdtemp""
	   From d_mkdtemp.U:

	   This variable conditionally defines the "HAS_MKDTEMP"
	   symbol, which indicates to the C program that the
	   mkdtemp() routine is available to exclusively create a
	   uniquely named temporary directory.

       ""d_mkfifo""
	   From d_mkfifo.U:

	   This variable conditionally defines the "HAS_MKFIFO"
	   symbol, which indicates to the C program that the
	   mkfifo() routine is available.

       ""d_mkstemp""
	   From d_mkstemp.U:

	   This variable conditionally defines the "HAS_MKSTEMP"
	   symbol, which indicates to the C program that the
	   mkstemp() routine is available to exclusively create
	   and open a uniquely named temporary file.

       ""d_mkstemps""
	   From d_mkstemps.U:

	   This variable conditionally defines the "HAS_MKSTEMPS"
	   symbol, which indicates to the C program that the
	   mkstemps() routine is available to exclusively create
	   and open a uniquely named (with a suffix) temporary
	   file.

       ""d_mktime""
	   From d_mktime.U:

	   This variable conditionally defines the "HAS_MKTIME"
	   symbol, which indicates to the C program that the
	   mktime() routine is available.

       ""d_mmap""
	   From d_mmap.U:

	   This variable conditionally defines "HAS_MMAP" if
	   mmap() is available to map a file into memory.

       ""d_modfl""
	   From d_modfl.U:

	   This variable conditionally defines the "HAS_MODFL"
	   symbol, which indicates to the C program that the
	   modfl() routine is available.

       ""d_mprotect""
	   From d_mprotect.U:

	   This variable conditionally defines "HAS_MPROTECT" if
	   mprotect() is available to modify the access protec
	   tion of a memory mapped file.

       ""d_msg""
	   From d_msg.U:

	   This variable conditionally defines the "HAS_MSG" sym
	   bol, which indicates that the entire msg*(2) library
	   is present.

       ""d_msg_ctrunc""
	   From d_socket.U:

	   This variable conditionally defines the
	   "HAS_MSG_CTRUNC" symbol, which indicates that the
	   "MSG_CTRUNC" is available.  #ifdef is not enough
	   because it may be an enum, glibc has been known to do
	   this.

       ""d_msg_dontroute""
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_DON
	   TROUTE" symbol, which indicates that the "MSG_DON
	   TROUTE" is available.  #ifdef is not enough because it
	   may be an enum, glibc has been known to do this.

       ""d_msg_oob""
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_OOB"
	   symbol, which indicates that the "MSG_OOB" is avail
	   able.  #ifdef is not enough because it may be an enum,
	   glibc has been known to do this.

       ""d_msg_peek""
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_PEEK"
	   symbol, which indicates that the "MSG_PEEK" is avail
	   able.  #ifdef is not enough because it may be an enum,
	   glibc has been known to do this.

       ""d_msg_proxy""
	   From d_socket.U:

	   This variable conditionally defines the
	   "HAS_MSG_PROXY" symbol, which indicates that the
	   "MSG_PROXY" is available.  #ifdef is not enough
	   because it may be an enum, glibc has been known to do
	   this.

       ""d_msgctl""
	   From d_msgctl.U:

	   This variable conditionally defines the "HAS_MSGCTL"
	   symbol, which indicates to the C program that the
	   msgctl() routine is available.

       ""d_msgget""
	   From d_msgget.U:

	   This variable conditionally defines the "HAS_MSGGET"
	   symbol, which indicates to the C program that the
	   msgget() routine is available.

       ""d_msgrcv""
	   From d_msgrcv.U:

	   This variable conditionally defines the "HAS_MSGRCV"
	   symbol, which indicates to the C program that the
	   msgrcv() routine is available.

       ""d_msgsnd""
	   From d_msgsnd.U:

	   This variable conditionally defines the "HAS_MSGSND"
	   symbol, which indicates to the C program that the
	   msgsnd() routine is available.

       ""d_msync""
	   From d_msync.U:

	   This variable conditionally defines "HAS_MSYNC" if
	   msync() is available to synchronize a mapped file.

       ""d_munmap""
	   From d_munmap.U:

	   This variable conditionally defines "HAS_MUNMAP" if
	   munmap() is available to unmap a region mapped by
	   mmap().

       ""d_mymalloc""
	   From mallocsrc.U:

	   This variable conditionally defines "MYMALLOC" in case
	   other parts of the source want to take special action
	   if "MYMALLOC" is used.  This may include different
	   sorts of profiling or error detection.

       ""d_nice""
	   From d_nice.U:

	   This variable conditionally defines the "HAS_NICE"
	   symbol, which indicates to the C program that the
	   nice() routine is available.

       ""d_nv_preserves_uv""
	   From perlxv.U:

	   This variable indicates whether a variable of type
	   nvtype can preserve all the bits a variable of type
	   uvtype.

       ""d_nv_preserves_uv_bits""
	   From perlxv.U:

	   This variable indicates how many of bits type uvtype a
	   variable nvtype can preserve.

       ""d_off64_t""
	   From d_off64_t.U:

	   This symbol will be defined if the C compiler supports
	   off64_t.

       ""d_old_pthread_create_joinable""
	   From d_pthrattrj.U:

	   This variable conditionally defines pthread_cre
	   ate_joinable.  undef if pthread.h defines
	   "PTHREAD_CREATE_JOINABLE".

       ""d_oldpthreads""
	   From usethreads.U:

	   This variable conditionally defines the
	   "OLD_PTHREADS_API" symbol, and indicates that Perl
	   should be built to use the old draft "POSIX" threads
	   "API".  This is only potentially meaningful if
	   usethreads is set.

       ""d_oldsock""
	   From d_socket.U:

	   This variable conditionally defines the "OLDSOCKET"
	   symbol, which indicates that the "BSD" socket inter
	   face is based on 4.1c and not 4.2.

       ""d_open3""
	   From d_open3.U:

	   This variable conditionally defines the HAS_OPEN3
	   manifest constant, which indicates to the C program
	   that the 3 argument version of the open(2) function is
	   available.

       ""d_pathconf""
	   From d_pathconf.U:

	   This variable conditionally defines the "HAS_PATHCONF"
	   symbol, which indicates to the C program that the
	   pathconf() routine is available to determine file-sys
	   tem related limits and options associated with a given
	   filename.

       ""d_pause""
	   From d_pause.U:

	   This variable conditionally defines the "HAS_PAUSE"
	   symbol, which indicates to the C program that the
	   pause() routine is available to suspend a process
	   until a signal is received.

       ""d_perl_otherlibdirs""
	   From otherlibdirs.U:

	   This variable conditionally defines "PERL_OTHERLIB
	   DIRS", which contains a colon-separated set of paths
	   for the perl binary to include in @"INC".  See also
	   otherlibdirs.

       ""d_phostname""
	   From d_gethname.U:

	   This variable conditionally defines the "HAS_PHOST
	   NAME" symbol, which contains the shell command which,
	   when fed to popen(), may be used to derive the host
	   name.

       ""d_pipe""
	   From d_pipe.U:

	   This variable conditionally defines the "HAS_PIPE"
	   symbol, which indicates to the C program that the
	   pipe() routine is available to create an inter-process
	   channel.

       ""d_poll""
	   From d_poll.U:

	   This variable conditionally defines the "HAS_POLL"
	   symbol, which indicates to the C program that the
	   poll() routine is available to poll active file
	   descriptors.

       ""d_portable""
	   From d_portable.U:

	   This variable conditionally defines the "PORTABLE"
	   symbol, which indicates to the C program that it
	   should not assume that it is running on the machine it
	   was compiled on.

       ""d_PRId64""
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRId64
	   symbol, which indiciates that stdio has a symbol to
	   print 64-bit decimal numbers.

       ""d_PRIeldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   print long doubles.

       ""d_PRIEUldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   print long doubles.	The "U" in the name is to sepa
	   rate this from d_PRIeldbl so that even case-blind sys
	   tems can see the difference.

       ""d_PRIfldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   print long doubles.

       ""d_PRIFUldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   print long doubles.	The "U" in the name is to sepa
	   rate this from d_PRIfldbl so that even case-blind sys
	   tems can see the difference.

       ""d_PRIgldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   print long doubles.

       ""d_PRIGUldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   print long doubles.	The "U" in the name is to sepa
	   rate this from d_PRIgldbl so that even case-blind sys
	   tems can see the difference.

       ""d_PRIi64""
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIi64
	   symbol, which indiciates that stdio has a symbol to
	   print 64-bit decimal numbers.

       ""d_PRIo64""
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIo64
	   symbol, which indiciates that stdio has a symbol to
	   print 64-bit octal numbers.

       ""d_PRIu64""
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIu64
	   symbol, which indiciates that stdio has a symbol to
	   print 64-bit unsigned decimal numbers.

       ""d_PRIx64""
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIx64
	   symbol, which indiciates that stdio has a symbol to
	   print 64-bit hexadecimal numbers.

       ""d_PRIXU64""
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIXU64
	   symbol, which indiciates that stdio has a symbol to
	   print 64-bit hExADECimAl numbers.  The "U" in the name
	   is to separate this from d_PRIx64 so that even case-
	   blind systems can see the difference.

       ""d_pthread_yield""
	   From d_pthread_y.U:

	   This variable conditionally defines the
	   "HAS_PTHREAD_YIELD" symbol if the pthread_yield rou
	   tine is available to yield the execution of the cur
	   rent thread.

       ""d_pwage""
	   From i_pwd.U:

	   This variable conditionally defines "PWAGE", which
	   indicates that struct passwd contains pw_age.

       ""d_pwchange""
	   From i_pwd.U:

	   This variable conditionally defines "PWCHANGE", which
	   indicates that struct passwd contains pw_change.

       ""d_pwclass""
	   From i_pwd.U:

	   This variable conditionally defines "PWCLASS", which
	   indicates that struct passwd contains pw_class.

       ""d_pwcomment""
	   From i_pwd.U:

	   This variable conditionally defines "PWCOMMENT", which
	   indicates that struct passwd contains pw_comment.

       ""d_pwexpire""
	   From i_pwd.U:

	   This variable conditionally defines "PWEXPIRE", which
	   indicates that struct passwd contains pw_expire.

       ""d_pwgecos""
	   From i_pwd.U:

	   This variable conditionally defines "PWGECOS", which
	   indicates that struct passwd contains pw_gecos.

       ""d_pwpasswd""
	   From i_pwd.U:

	   This variable conditionally defines "PWPASSWD", which
	   indicates that struct passwd contains pw_passwd.

       ""d_pwquota""
	   From i_pwd.U:

	   This variable conditionally defines "PWQUOTA", which
	   indicates that struct passwd contains pw_quota.

       ""d_qgcvt""
	   From d_qgcvt.U:

	   This variable conditionally defines the "HAS_QGCVT"
	   symbol, which indicates to the C program that the
	   qgcvt() routine is available.

       ""d_quad""
	   From quadtype.U:

	   This variable, if defined, tells that there's a 64-bit
	   integer type, quadtype.

       ""d_readdir""
	   From d_readdir.U:

	   This variable conditionally defines "HAS_READDIR" if
	   readdir() is available to read directory entries.

       ""d_readlink""
	   From d_readlink.U:

	   This variable conditionally defines the "HAS_READLINK"
	   symbol, which indicates to the C program that the
	   readlink() routine is available to read the value of a
	   symbolic link.

       ""d_rename""
	   From d_rename.U:

	   This variable conditionally defines the "HAS_RENAME"
	   symbol, which indicates to the C program that the
	   rename() routine is available to rename files.

       ""d_rewinddir""
	   From d_readdir.U:

	   This variable conditionally defines "HAS_REWINDDIR" if
	   rewinddir() is available.

       ""d_rmdir""
	   From d_rmdir.U:

	   This variable conditionally defines "HAS_RMDIR" if
	   rmdir() is available to remove directories.

       ""d_safebcpy""
	   From d_safebcpy.U:

	   This variable conditionally defines the
	   "HAS_SAFE_BCOPY" symbol if the bcopy() routine can do
	   overlapping copies.

       ""d_safemcpy""
	   From d_safemcpy.U:

	   This variable conditionally defines the "HAS_SAFE_MEM
	   CPY" symbol if the memcpy() routine can do overlapping
	   copies.

       ""d_sanemcmp""
	   From d_sanemcmp.U:

	   This variable conditionally defines the "HAS_SANE_MEM
	   CMP" symbol if the memcpy() routine is available and
	   can be used to compare relative magnitudes of chars
	   with their high bits set.

       ""d_sbrkproto""
	   From d_sbrkproto.U:

	   This variable conditionally defines the
	   "HAS_SBRK_PROTO" symbol, which indicates to the C pro
	   gram that the system provides a prototype for the
	   sbrk() function.  Otherwise, it is up to the program
	   to supply one.

       ""d_sched_yield""
	   From d_pthread_y.U:

	   This variable conditionally defines the
	   "HAS_SCHED_YIELD" symbol if the sched_yield routine is
	   available to yield the execution of the current
	   thread.

       ""d_scm_rights""
	   From d_socket.U:

	   This variable conditionally defines the
	   "HAS_SCM_RIGHTS" symbol, which indicates that the
	   "SCM_RIGHTS" is available.  #ifdef is not enough
	   because it may be an enum, glibc has been known to do
	   this.

       ""d_SCNfldbl""
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl
	   symbol, which indiciates that stdio has a symbol to
	   scan long doubles.

       ""d_seekdir""
	   From d_readdir.U:

	   This variable conditionally defines "HAS_SEEKDIR" if
	   seekdir() is available.

       ""d_select""
	   From d_select.U:

	   This variable conditionally defines "HAS_SELECT" if
	   select() is available to select active file descrip
	   tors. A <sys/time.h> inclusion may be necessary for
	   the timeout field.

       ""d_sem""
	   From d_sem.U:

	   This variable conditionally defines the "HAS_SEM" sym
	   bol, which indicates that the entire sem*(2) library
	   is present.

       ""d_semctl""
	   From d_semctl.U:

	   This variable conditionally defines the "HAS_SEMCTL"
	   symbol, which indicates to the C program that the sem_
	   ctl() routine is available.

       ""d_semctl_semid_ds""
	   From d_union_semun.U:

	   This variable conditionally defines "USE_SEM
	   CTL_SEMID_DS", which indicates that struct semid_ds *
	   is to be used for semctl "IPC_STAT".

       ""d_semctl_semun""
	   From d_union_semun.U:

	   This variable conditionally defines "USE_SEM
	   CTL_SEMUN", which indicates that union semun is to be
	   used for semctl "IPC_STAT".

       ""d_semget""
	   From d_semget.U:

	   This variable conditionally defines the "HAS_SEMGET"
	   symbol, which indicates to the C program that the
	   semget() routine is available.

       ""d_semop""
	   From d_semop.U:

	   This variable conditionally defines the "HAS_SEMOP"
	   symbol, which indicates to the C program that the
	   semop() routine is available.

       ""d_setegid""
	   From d_setegid.U:

	   This variable conditionally defines the "HAS_SETEGID"
	   symbol, which indicates to the C program that the
	   setegid() routine is available to change the effective
	   gid of the current program.

       ""d_seteuid""
	   From d_seteuid.U:

	   This variable conditionally defines the "HAS_SETEUID"
	   symbol, which indicates to the C program that the
	   seteuid() routine is available to change the effective
	   uid of the current program.

       ""d_setgrent""
	   From d_setgrent.U:

	   This variable conditionally defines the "HAS_SETGRENT"
	   symbol, which indicates to the C program that the set_
	   grent() routine is available for initializing sequen
	   tial access to the group database.

       ""d_setgrps""
	   From d_setgrps.U:

	   This variable conditionally defines the "HAS_SET
	   GROUPS" symbol, which indicates to the C program that
	   the setgroups() routine is available to set the list
	   of process groups.

       ""d_sethent""
	   From d_sethent.U:

	   This variable conditionally defines "HAS_SETHOSTENT"
	   if sethostent() is available.

       ""d_setlinebuf""
	   From d_setlnbuf.U:

	   This variable conditionally defines the "HAS_SET
	   LINEBUF" symbol, which indicates to the C program that
	   the setlinebuf() routine is available to change stderr
	   or stdout from block-buffered or unbuffered to a line-
	   buffered mode.

       ""d_setlocale""
	   From d_setlocale.U:

	   This variable conditionally defines "HAS_SETLOCALE" if
	   setlocale() is available to handle locale-specific
	   ctype implementations.

       ""d_setnent""
	   From d_setnent.U:

	   This variable conditionally defines "HAS_SETNETENT" if
	   setnetent() is available.

       ""d_setpent""
	   From d_setpent.U:

	   This variable conditionally defines "HAS_SETPROTOENT"
	   if setprotoent() is available.

       ""d_setpgid""
	   From d_setpgid.U:

	   This variable conditionally defines the "HAS_SETPGID"
	   symbol if the setpgid(pid, gpid) function is available
	   to set process group "ID".

       ""d_setpgrp2""
	   From d_setpgrp2.U:

	   This variable conditionally defines the HAS_SETPGRP2
	   symbol, which indicates to the C program that the
	   setpgrp2() (as in DG/"UX") routine is available to set
	   the current process group.

       ""d_setpgrp""
	   From d_setpgrp.U:

	   This variable conditionally defines "HAS_SETPGRP" if
	   setpgrp() is available to set the current process
	   group.

       ""d_setprior""
	   From d_setprior.U:

	   This variable conditionally defines "HAS_SETPRIORITY"
	   if setpriority() is available to set a process's
	   priority.

       ""d_setproctitle""
	   From d_setproctitle.U:

	   This variable conditionally defines the "HAS_SETPROC
	   TITLE" symbol, which indicates to the C program that
	   the setproctitle() routine is available.

       ""d_setpwent""
	   From d_setpwent.U:

	   This variable conditionally defines the "HAS_SETPWENT"
	   symbol, which indicates to the C program that the set_
	   pwent() routine is available for initializing sequen
	   tial access to the passwd database.

       ""d_setregid""
	   From d_setregid.U:

	   This variable conditionally defines "HAS_SETREGID" if
	   setregid() is available to change the real and effec
	   tive gid of the current process.

       ""d_setresgid""
	   From d_setregid.U:

	   This variable conditionally defines "HAS_SETRESGID" if
	   setresgid() is available to change the real, effective
	   and saved gid of the current process.

       ""d_setresuid""
	   From d_setreuid.U:

	   This variable conditionally defines "HAS_SETREUID" if
	   setresuid() is available to change the real, effective
	   and saved uid of the current process.

       ""d_setreuid""
	   From d_setreuid.U:

	   This variable conditionally defines "HAS_SETREUID" if
	   setreuid() is available to change the real and effec
	   tive uid of the current process.

       ""d_setrgid""
	   From d_setrgid.U:

	   This variable conditionally defines the "HAS_SETRGID"
	   symbol, which indicates to the C program that the
	   setrgid() routine is available to change the real gid
	   of the current program.

       ""d_setruid""
	   From d_setruid.U:

	   This variable conditionally defines the "HAS_SETRUID"
	   symbol, which indicates to the C program that the
	   setruid() routine is available to change the real uid
	   of the current program.

       ""d_setsent""
	   From d_setsent.U:

	   This variable conditionally defines "HAS_SETSERVENT"
	   if setservent() is available.

       ""d_setsid""
	   From d_setsid.U:

	   This variable conditionally defines "HAS_SETSID" if
	   setsid() is available to set the process group "ID".

       ""d_setvbuf""
	   From d_setvbuf.U:

	   This variable conditionally defines the "HAS_SETVBUF"
	   symbol, which indicates to the C program that the
	   setvbuf() routine is available to change buffering on
	   an open stdio stream.

       ""d_sfio""
	   From d_sfio.U:

	   This variable conditionally defines the "USE_SFIO"
	   symbol, and indicates whether sfio is available (and
	   should be used).

       ""d_shm""
	   From d_shm.U:

	   This variable conditionally defines the "HAS_SHM" sym
	   bol, which indicates that the entire shm*(2) library
	   is present.

       ""d_shmat""
	   From d_shmat.U:

	   This variable conditionally defines the "HAS_SHMAT"
	   symbol, which indicates to the C program that the
	   shmat() routine is available.

       ""d_shmatprototype""
	   From d_shmat.U:

	   This variable conditionally defines the
	   "HAS_SHMAT_PROTOTYPE" symbol, which indicates that
	   sys/shm.h has a prototype for shmat.

       ""d_shmctl""
	   From d_shmctl.U:

	   This variable conditionally defines the "HAS_SHMCTL"
	   symbol, which indicates to the C program that the shm_
	   ctl() routine is available.

       ""d_shmdt""
	   From d_shmdt.U:

	   This variable conditionally defines the "HAS_SHMDT"
	   symbol, which indicates to the C program that the
	   shmdt() routine is available.

       ""d_shmget""
	   From d_shmget.U:

	   This variable conditionally defines the "HAS_SHMGET"
	   symbol, which indicates to the C program that the
	   shmget() routine is available.

       ""d_sigaction""
	   From d_sigaction.U:

	   This variable conditionally defines the "HAS_SIGAC
	   TION" symbol, which indicates that the Vr4 sigaction()
	   routine is available.

       ""d_sigprocmask""
	   From d_sigprocmask.U:

	   This variable conditionally defines "HAS_SIGPROCMASK"
	   if sigprocmask() is available to examine or change the
	   signal mask of the calling process.

       ""d_sigsetjmp""
	   From d_sigsetjmp.U:

	   This variable conditionally defines the
	   "HAS_SIGSETJMP" symbol, which indicates that the
	   sigsetjmp() routine is available to call setjmp() and
	   optionally save the process's signal mask.

       ""d_socket""
	   From d_socket.U:

	   This variable conditionally defines "HAS_SOCKET",
	   which indicates that the "BSD" socket interface is
	   supported.

       ""d_socklen_t""
	   From d_socklen_t.U:

	   This symbol will be defined if the C compiler supports
	   socklen_t.

       ""d_sockpair""
	   From d_socket.U:

	   This variable conditionally defines the "HAS_SOCKET
	   PAIR" symbol, which indicates that the "BSD" socket_
	   pair() is supported.

       ""d_socks5_init""
	   From d_socks5_init.U:

	   This variable conditionally defines the
	   HAS_SOCKS5_INIT symbol, which indicates to the C pro
	   gram that the socks5_init() routine is available.

       ""d_sqrtl""
	   From d_sqrtl.U:

	   This variable conditionally defines the "HAS_SQRTL"
	   symbol, which indicates to the C program that the
	   sqrtl() routine is available.

       ""d_statblks""
	   From d_statblks.U:

	   This variable conditionally defines "USE_STAT_BLOCKS"
	   if this system has a stat structure declaring st_blk
	   size and st_blocks.

       ""d_statfs_f_flags""
	   From d_statfs_f_flags.U:

	   This variable conditionally defines the
	   "HAS_STRUCT_STATFS_F_FLAGS" symbol, which indicates to
	   struct statfs from has f_flags member.  This kind of
	   struct statfs is coming from sys/mount.h ("BSD"), not
	   from sys/statfs.h ("SYSV").

       ""d_statfs_s""
	   From d_statfs_s.U:

	   This variable conditionally defines the
	   "HAS_STRUCT_STATFS" symbol, which indicates that the
	   struct statfs is supported.

       ""d_statvfs""
	   From d_statvfs.U:

	   This variable conditionally defines the "HAS_STATVFS"
	   symbol, which indicates to the C program that the
	   statvfs() routine is available.

       ""d_stdio_cnt_lval""
	   From d_stdstdio.U:

	   This variable conditionally defines "STDIO_CNT_LVALUE"
	   if the "FILE_cnt" macro can be used as an lvalue.

       ""d_stdio_ptr_lval""
	   From d_stdstdio.U:

	   This variable conditionally defines "STDIO_PTR_LVALUE"
	   if the "FILE_ptr" macro can be used as an lvalue.

       ""d_stdio_ptr_lval_nochange_cnt""
	   From d_stdstdio.U:

	   This symbol is defined if using the "FILE_ptr" macro
	   as an lvalue to increase the pointer by n leaves
	   File_cnt(fp) unchanged.

       ""d_stdio_ptr_lval_sets_cnt""
	   From d_stdstdio.U:

	   This symbol is defined if using the "FILE_ptr" macro
	   as an lvalue to increase the pointer by n has the side
	   effect of decreasing the value of File_cnt(fp) by n.

       ""d_stdio_stream_array""
	   From stdio_streams.U:

	   This variable tells whether there is an array holding
	   the stdio streams.

       ""d_stdiobase""
	   From d_stdstdio.U:

	   This variable conditionally defines "USE_STDIO_BASE"
	   if this system has a "FILE" structure declaring a
	   usable _base field (or equivalent) in stdio.h.

       ""d_stdstdio""
	   From d_stdstdio.U:

	   This variable conditionally defines "USE_STDIO_PTR" if
	   this system has a "FILE" structure declaring usable
	   _ptr and _cnt fields (or equivalent) in stdio.h.

       ""d_strchr""
	   From d_strchr.U:

	   This variable conditionally defines "HAS_STRCHR" if
	   strchr() and strrchr() are available for string
	   searching.

       ""d_strcoll""
	   From d_strcoll.U:

	   This variable conditionally defines "HAS_STRCOLL" if
	   strcoll() is available to compare strings using col
	   lating information.

       ""d_strctcpy""
	   From d_strctcpy.U:

	   This variable conditionally defines the
	   "USE_STRUCT_COPY" symbol, which indicates to the C
	   program that this C compiler knows how to copy struc
	   tures.

       ""d_strerrm""
	   From d_strerror.U:

	   This variable holds what Strerrr is defined as to
	   translate an error code condition into an error mes
	   sage string. It could be "strerror" or a more "com
	   plex" macro emulating strrror with sys_errlist[], or
	   the "unknown" string when both strerror and
	   sys_errlist are missing.

       ""d_strerror""
	   From d_strerror.U:

	   This variable conditionally defines "HAS_STRERROR" if
	   strerror() is available to translate error numbers to
	   strings.

       ""d_strtod""
	   From d_strtod.U:

	   This variable conditionally defines the "HAS_STRTOD"
	   symbol, which indicates to the C program that the str_
	   tod() routine is available to provide better numeric
	   string conversion than atof().

       ""d_strtol""
	   From d_strtol.U:

	   This variable conditionally defines the "HAS_STRTOL"
	   symbol, which indicates to the C program that the str_
	   tol() routine is available to provide better numeric
	   string conversion than atoi() and friends.

       ""d_strtold""
	   From d_strtold.U:

	   This variable conditionally defines the "HAS_STRTOLD"
	   symbol, which indicates to the C program that the str_
	   told() routine is available.

       ""d_strtoll""
	   From d_strtoll.U:

	   This variable conditionally defines the "HAS_STRTOLL"
	   symbol, which indicates to the C program that the str_
	   toll() routine is available.

       ""d_strtoq""
	   From d_strtoq.U:

	   This variable conditionally defines the "HAS_STRTOQ"
	   symbol, which indicates to the C program that the str_
	   toq() routine is available.

       ""d_strtoul""
	   From d_strtoul.U:

	   This variable conditionally defines the "HAS_STRTOUL"
	   symbol, which indicates to the C program that the str_
	   toul() routine is available to provide conversion of
	   strings to unsigned long.

       ""d_strtoull""
	   From d_strtoull.U:

	   This variable conditionally defines the "HAS_STRTOULL"
	   symbol, which indicates to the C program that the str_
	   toull() routine is available.

       ""d_strtouq""
	   From d_strtouq.U:

	   This variable conditionally defines the "HAS_STRTOUQ"
	   symbol, which indicates to the C program that the str_
	   touq() routine is available.

       ""d_strxfrm""
	   From d_strxfrm.U:

	   This variable conditionally defines "HAS_STRXFRM" if
	   strxfrm() is available to transform strings.

       ""d_suidsafe""
	   From d_dosuid.U:

	   This variable conditionally defines
	   "SETUID_SCRIPTS_ARE_SECURE_NOW" if setuid scripts can
	   be secure.  This test looks in /dev/fd/.

       ""d_symlink""
	   From d_symlink.U:

	   This variable conditionally defines the "HAS_SYMLINK"
	   symbol, which indicates to the C program that the sym_
	   link() routine is available to create symbolic links.

       ""d_syscall""
	   From d_syscall.U:

	   This variable conditionally defines "HAS_SYSCALL" if
	   syscall() is available call arbitrary system calls.

       ""d_sysconf""
	   From d_sysconf.U:

	   This variable conditionally defines the "HAS_SYSCONF"
	   symbol, which indicates to the C program that the
	   sysconf() routine is available to determine system
	   related limits and options.

       ""d_sysernlst""
	   From d_strerror.U:

	   This variable conditionally defines "HAS_SYS_ERRNO
	   LIST" if sys_errnolist[] is available to translate
	   error numbers to the symbolic name.

       ""d_syserrlst""
	   From d_strerror.U:

	   This variable conditionally defines "HAS_SYS_ERRLIST"
	   if sys_errlist[] is available to translate error num
	   bers to strings.

       ""d_system""
	   From d_system.U:

	   This variable conditionally defines "HAS_SYSTEM" if
	   system() is available to issue a shell command.

       ""d_tcgetpgrp""
	   From d_tcgtpgrp.U:

	   This variable conditionally defines the "HAS_TCGETP
	   GRP" symbol, which indicates to the C program that the
	   tcgetpgrp() routine is available.  to get foreground
	   process group "ID".

       ""d_tcsetpgrp""
	   From d_tcstpgrp.U:

	   This variable conditionally defines the "HAS_TCSETP
	   GRP" symbol, which indicates to the C program that the
	   tcsetpgrp() routine is available to set foreground
	   process group "ID".

       ""d_telldir""
	   From d_readdir.U:

	   This variable conditionally defines "HAS_TELLDIR" if
	   telldir() is available.

       ""d_telldirproto""
	   From d_telldirproto.U:

	   This variable conditionally defines the
	   "HAS_TELLDIR_PROTO" symbol, which indicates to the C
	   program that the system provides a prototype for the
	   telldir() function.	Otherwise, it is up to the pro
	   gram to supply one.

       ""d_time""
	   From d_time.U:

	   This variable conditionally defines the "HAS_TIME"
	   symbol, which indicates that the time() routine
	   exists.  The time() routine is normaly provided on
	   "UNIX" systems.

       ""d_times""
	   From d_times.U:

	   This variable conditionally defines the "HAS_TIMES"
	   symbol, which indicates that the times() routine
	   exists.  The times() routine is normaly provided on
	   "UNIX" systems. You may have to include <sys/times.h>.

       ""d_truncate""
	   From d_truncate.U:

	   This variable conditionally defines "HAS_TRUNCATE" if
	   truncate() is available to truncate files.

       ""d_tzname""
	   From d_tzname.U:

	   This variable conditionally defines "HAS_TZNAME" if
	   tzname[] is available to access timezone names.

       ""d_umask""
	   From d_umask.U:

	   This variable conditionally defines the "HAS_UMASK"
	   symbol, which indicates to the C program that the
	   umask() routine is available.  to set and get the
	   value of the file creation mask.

       ""d_uname""
	   From d_gethname.U:

	   This variable conditionally defines the "HAS_UNAME"
	   symbol, which indicates to the C program that the
	   uname() routine may be used to derive the host name.

       ""d_union_semun""
	   From d_union_semun.U:

	   This variable conditionally defines "HAS_UNION_SEMUN"
	   if the union semun is defined by including
	   <sys/sem.h>.

       ""d_ustat""
	   From d_ustat.U:

	   This variable conditionally defines "HAS_USTAT" if
	   ustat() is available to query file system statistics
	   by dev_t.

       ""d_vendorarch""
	   From vendorarch.U:

	   This variable conditionally defined "PERL_VENDORARCH".

       ""d_vendorbin""
	   From vendorbin.U:

	   This variable conditionally defines "PERL_VENDORBIN".

       ""d_vendorlib""
	   From vendorlib.U:

	   This variable conditionally defines "PERL_VENDORLIB".

       ""d_vfork""
	   From d_vfork.U:

	   This variable conditionally defines the "HAS_VFORK"
	   symbol, which indicates the vfork() routine is avail
	   able.

       ""d_void_closedir""
	   From d_closedir.U:

	   This variable conditionally defines "VOID_CLOSEDIR" if
	   closedir() does not return a value.

       ""d_voidsig""
	   From d_voidsig.U:

	   This variable conditionally defines "VOIDSIG" if this
	   system declares "void (*signal(...))()" in signal.h.
	   The old way was to declare it as "int (*sig
	   nal(...))()".

       ""d_voidtty""
	   From i_sysioctl.U:

	   This variable conditionally defines "USE_IOCNOTTY" to
	   indicate that the ioctl() call with "TIOCNOTTY" should
	   be used to void tty association.  Otherwise (on "USG"
	   probably), it is enough to close the standard file
	   decriptors and do a setpgrp().

       ""d_volatile""
	   From d_volatile.U:

	   This variable conditionally defines the "HASVOLATILE"
	   symbol, which indicates to the C program that this C
	   compiler knows about the volatile declaration.

       ""d_vprintf""
	   From d_vprintf.U:

	   This variable conditionally defines the "HAS_VPRINTF"
	   symbol, which indicates to the C program that the
	   vprintf() routine is available to printf with a
	   pointer to an argument list.

       ""d_wait4""
	   From d_wait4.U:

	   This variable conditionally defines the HAS_WAIT4 sym
	   bol, which indicates the wait4() routine is available.

       ""d_waitpid""
	   From d_waitpid.U:

	   This variable conditionally defines "HAS_WAITPID" if
	   waitpid() is available to wait for child process.

       ""d_wcstombs""
	   From d_wcstombs.U:

	   This variable conditionally defines the "HAS_WCSTOMBS"
	   symbol, which indicates to the C program that the
	   wcstombs() routine is available to convert wide char
	   acter strings to multibyte strings.

       ""d_wctomb""
	   From d_wctomb.U:

	   This variable conditionally defines the "HAS_WCTOMB"
	   symbol, which indicates to the C program that the
	   wctomb() routine is available to convert a wide char
	   acter to a multibyte.

       ""d_xenix""
	   From Guess.U:

	   This variable conditionally defines the symbol
	   "XENIX", which alerts the C program that it runs under
	   Xenix.

       ""date""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the date pro
	   gram.  After Configure runs, the value is reset to a
	   plain "date" and is not useful.

       ""db_hashtype""
	   From i_db.U:

	   This variable contains the type of the hash structure
	   element in the <db.h> header file.  In older versions
	   of "DB", it was int, while in newer ones it is
	   u_int32_t.

       ""db_prefixtype""
	   From i_db.U:

	   This variable contains the type of the prefix struc
	   ture element in the <db.h> header file.  In older ver
	   sions of "DB", it was int, while in newer ones it is
	   size_t.

       ""defvoidused""
	   From voidflags.U:

	   This variable contains the default value of the
	   "VOIDUSED" symbol (15).

       ""direntrytype""
	   From i_dirent.U:

	   This symbol is set to "struct direct" or "struct
	   dirent" depending on whether dirent is available or
	   not. You should use this pseudo type to portably
	   declare your directory entries.

       ""dlext""
	   From dlext.U:

	   This variable contains the extension that is to be
	   used for the dynamically loaded modules that perl gen
	   eraties.

       ""dlsrc""
	   From dlsrc.U:

	   This variable contains the name of the dynamic loading
	   file that will be used with the package.

       ""doublesize""
	   From doublesize.U:

	   This variable contains the value of the "DOUBLESIZE"
	   symbol, which indicates to the C program how many
	   bytes there are in a double.

       ""drand01""
	   From randfunc.U:

	   Indicates the macro to be used to generate normalized
	   random numbers.  Uses randfunc, often divided by (dou
	   ble) (((unsigned long) 1 << randbits)) in order to
	   normalize the result.  In C programs, the macro
	   "Drand01" is mapped to drand01.

       ""dynamic_ext""
	   From Extensions.U:

	   This variable holds a list of "XS" extension files we
	   want to link dynamically into the package.  It is used
	   by Makefile.

       e

       ""eagain""
	   From nblock_io.U:

	   This variable bears the symbolic errno code set by
	   read() when no data is present on the file and non-
	   blocking I/O was enabled (otherwise, read() blocks
	   naturally).

       ""ebcdic""
	   From ebcdic.U:

	   This variable conditionally defines "EBCDIC" if this
	   system uses "EBCDIC" encoding.  Among other things,
	   this means that the character ranges are not contigu
	   ous.	 See trnl.U

       ""echo""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the echo pro
	   gram.  After Configure runs, the value is reset to a
	   plain "echo" and is not useful.

       ""egrep""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the egrep pro
	   gram.  After Configure runs, the value is reset to a
	   plain "egrep" and is not useful.

       ""emacs""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""eunicefix""
	   From Init.U:

	   When running under Eunice this variable contains a
	   command which will convert a shell script to the
	   proper form of text file for it to be executable by
	   the shell.  On other systems it is a no-op.

       ""exe_ext""
	   From Unix.U:

	   This is an old synonym for _exe.

       ""expr""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the expr pro
	   gram.  After Configure runs, the value is reset to a
	   plain "expr" and is not useful.

       ""extensions""
	   From Extensions.U:

	   This variable holds a list of all extension files
	   (both "XS" and non-xs linked into the package.  It is
	   propagated to Config.pm and is typically used to test
	   whether a particular extesion is available.

       f

       ""fflushall""
	   From fflushall.U:

	   This symbol, if defined, tells that to flush all pend
	   ing stdio output one must loop through all the stdio
	   file handles stored in an array and fflush them.  Note
	   that if fflushNULL is defined, fflushall will not even
	   be probed for and will be left undefined.

       ""fflushNULL""
	   From fflushall.U:

	   This symbol, if defined, tells that fflush("NULL")
	   does flush all pending stdio output.

       ""find""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""firstmakefile""
	   From Unix.U:

	   This variable defines the first file searched by make.
	   On unix, it is makefile (then Makefile).  On case-
	   insensitive systems, it might be something else.  This
	   is only used to deal with convoluted make depend
	   tricks.

       ""flex""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""fpossize""
	   From fpossize.U:

	   This variable contains the size of a fpostype in
	   bytes.

       ""fpostype""
	   From fpostype.U:

	   This variable defines Fpos_t to be something like
	   fpos_t, long, uint, or whatever type is used to
	   declare file positions in libc.

       ""freetype""
	   From mallocsrc.U:

	   This variable contains the return type of free().  It
	   is usually void, but occasionally int.

       ""full_ar""
	   From Loc_ar.U:

	   This variable contains the full pathname to "ar",
	   whether or not the user has specified "portability".
	   This is only used in the Makefile.SH.

       ""full_csh""
	   From d_csh.U:

	   This variable contains the full pathname to "csh",
	   whether or not the user has specified "portability".
	   This is only used in the compiled C program, and we
	   assume that all systems which can share this exe
	   cutable will have the same full pathname to csh.

       ""full_sed""
	   From Loc_sed.U:

	   This variable contains the full pathname to "sed",
	   whether or not the user has specified "portability".
	   This is only used in the compiled C program, and we
	   assume that all systems which can share this exe
	   cutable will have the same full pathname to sed.

       g

       ""gccosandvers""
	   From gccvers.U:

	   If "GNU" cc (gcc) is used, this variable the operating
	   system and version used to compile the gcc.	It is set
	   to '' if not gcc, or if nothing useful can be parsed
	   as the os version.

       ""gccversion""
	   From gccvers.U:

	   If "GNU" cc (gcc) is used, this variable holds "1" or
	   "2" to indicate whether the compiler is version 1 or
	   2.  This is used in setting some of the default
	   cflags.  It is set to '' if not gcc.

       ""gidformat""
	   From gidf.U:

	   This variable contains the format string used for
	   printing a Gid_t.

       ""gidsign""
	   From gidsign.U:

	   This variable contains the signedness of a gidtype.	1
	   for unsigned, -1 for signed.

       ""gidsize""
	   From gidsize.U:

	   This variable contains the size of a gidtype in bytes.

       ""gidtype""
	   From gidtype.U:

	   This variable defines Gid_t to be something like
	   gid_t, int, ushort, or whatever type is used to
	   declare the return type of getgid().	 Typically, it is
	   the type of group ids in the kernel.

       ""glibpth""
	   From libpth.U:

	   This variable holds the general path (space-separated)
	   used to find libraries.  It may contain directories
	   that do not exist on this platform, libpth is the
	   cleaned-up version.

       ""grep""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the grep pro
	   gram.  After Configure runs, the value is reset to a
	   plain "grep" and is not useful.

       ""groupcat""
	   From nis.U:

	   This variable contains a command that produces the
	   text of the /etc/group file.	 This is normally "cat
	   /etc/group", but can be "ypcat group" when "NIS" is
	   used.  On some systems, such as os390, there may be no
	   equivalent command, in which case this variable is
	   unset.

       ""groupstype""
	   From groupstype.U:

	   This variable defines Groups_t to be something like
	   gid_t, int, ushort, or whatever type is used for the
	   second argument to getgroups() and setgroups().  Usu
	   ally, this is the same as gidtype (gid_t), but some
	   times it isn't.

       ""gzip""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the gzip pro
	   gram.  After Configure runs, the value is reset to a
	   plain "gzip" and is not useful.

       h

       ""h_fcntl""
	   From h_fcntl.U:

	   This is variable gets set in various places to tell
	   i_fcntl that <fcntl.h> should be included.

       ""h_sysfile""
	   From h_sysfile.U:

	   This is variable gets set in various places to tell
	   i_sys_file that <sys/file.h> should be included.

       ""hint""
	   From Oldconfig.U:

	   Gives the type of hints used for previous answers. May
	   be one of "default", "recommended" or "previous".

       ""hostcat""
	   From nis.U:

	   This variable contains a command that produces the
	   text of the /etc/hosts file.	 This is normally "cat
	   /etc/hosts", but can be "ypcat hosts" when "NIS" is
	   used.  On some systems, such as os390, there may be no
	   equivalent command, in which case this variable is
	   unset.

       i

       ""i16size""
	   From perlxv.U:

	   This variable is the size of an I16 in bytes.

       ""i16type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's I16.

       ""i32size""
	   From perlxv.U:

	   This variable is the size of an I32 in bytes.

       ""i32type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's I32.

       ""i64size""
	   From perlxv.U:

	   This variable is the size of an I64 in bytes.

       ""i64type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's I64.

       ""i8size""
	   From perlxv.U:

	   This variable is the size of an I8 in bytes.

       ""i8type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's I8.

       ""i_arpainet""
	   From i_arpainet.U:

	   This variable conditionally defines the "I_ARPA_INET"
	   symbol, and indicates whether a C program should
	   include <arpa/inet.h>.

       ""i_bsdioctl""
	   From i_sysioctl.U:

	   This variable conditionally defines the
	   "I_SYS_BSDIOCTL" symbol, which indicates to the C pro
	   gram that <sys/bsdioctl.h> exists and should be
	   included.

       ""i_db""
	   From i_db.U:

	   This variable conditionally defines the "I_DB" symbol,
	   and indicates whether a C program may include Berke
	   ley's "DB" include file <db.h>.

       ""i_dbm""
	   From i_dbm.U:

	   This variable conditionally defines the "I_DBM" sym
	   bol, which indicates to the C program that <dbm.h>
	   exists and should be included.

       ""i_dirent""
	   From i_dirent.U:

	   This variable conditionally defines "I_DIRENT", which
	   indicates to the C program that it should include
	   <dirent.h>.

       ""i_dld""
	   From i_dld.U:

	   This variable conditionally defines the "I_DLD" sym
	   bol, which indicates to the C program that <dld.h>
	   ("GNU" dynamic loading) exists and should be included.

       ""i_dlfcn""
	   From i_dlfcn.U:

	   This variable conditionally defines the "I_DLFCN" sym
	   bol, which indicates to the C program that <dlfcn.h>
	   exists and should be included.

       ""i_fcntl""
	   From i_fcntl.U:

	   This variable controls the value of "I_FCNTL" (which
	   tells the C program to include <fcntl.h>).

       ""i_float""
	   From i_float.U:

	   This variable conditionally defines the "I_FLOAT" sym
	   bol, and indicates whether a C program may include
	   <float.h> to get symbols like "DBL_MAX" or "DBL_MIN",
	   i.e. machine dependent floating point values.

       ""i_gdbm""
	   From i_gdbm.U:

	   This variable conditionally defines the "I_GDBM" sym
	   bol, which indicates to the C program that <gdbm.h>
	   exists and should be included.

       ""i_grp""
	   From i_grp.U:

	   This variable conditionally defines the "I_GRP" sym
	   bol, and indicates whether a C program should include
	   <grp.h>.

       ""i_iconv""
	   From i_iconv.U:

	   This variable conditionally defines the "I_ICONV" sym
	   bol, and indicates whether a C program should include
	   <iconv.h>.

       ""i_ieeefp""
	   From i_ieeefp.U:

	   This variable conditionally defines the "I_IEEEFP"
	   symbol, and indicates whether a C program should
	   include <ieeefp.h>.

       ""i_inttypes""
	   From i_inttypes.U:

	   This variable conditionally defines the "I_INTTYPES"
	   symbol, and indicates whether a C program should
	   include <inttypes.h>.

       ""i_libutil""
	   From i_libutil.U:

	   This variable conditionally defines the "I_LIBUTIL"
	   symbol, and indicates whether a C program should
	   include <libutil.h>.

       ""i_limits""
	   From i_limits.U:

	   This variable conditionally defines the "I_LIMITS"
	   symbol, and indicates whether a C program may include
	   <limits.h> to get symbols like "WORD_BIT" and friends.

       ""i_locale""
	   From i_locale.U:

	   This variable conditionally defines the "I_LOCALE"
	   symbol, and indicates whether a C program should
	   include <locale.h>.

       ""i_machcthr""
	   From i_machcthr.U:

	   This variable conditionally defines the
	   "I_MACH_CTHREADS" symbol, and indicates whether a C
	   program should include <mach/cthreads.h>.

       ""i_malloc""
	   From i_malloc.U:

	   This variable conditionally defines the "I_MALLOC"
	   symbol, and indicates whether a C program should
	   include <malloc.h>.

       ""i_math""
	   From i_math.U:

	   This variable conditionally defines the "I_MATH" sym
	   bol, and indicates whether a C program may include
	   <math.h>.

       ""i_memory""
	   From i_memory.U:

	   This variable conditionally defines the "I_MEMORY"
	   symbol, and indicates whether a C program should
	   include <memory.h>.

       ""i_mntent""
	   From i_mntent.U:

	   This variable conditionally defines the "I_MNTENT"
	   symbol, and indicates whether a C program should
	   include <mntent.h>.

       ""i_ndbm""
	   From i_ndbm.U:

	   This variable conditionally defines the "I_NDBM" sym
	   bol, which indicates to the C program that <ndbm.h>
	   exists and should be included.

       ""i_netdb""
	   From i_netdb.U:

	   This variable conditionally defines the "I_NETDB" sym
	   bol, and indicates whether a C program should include
	   <netdb.h>.

       ""i_neterrno""
	   From i_neterrno.U:

	   This variable conditionally defines the "I_NET_ERRNO"
	   symbol, which indicates to the C program that
	   <net/errno.h> exists and should be included.

       ""i_netinettcp""
	   From i_netinettcp.U:

	   This variable conditionally defines the
	   "I_NETINET_TCP" symbol, and indicates whether a C pro
	   gram should include <netinet/tcp.h>.

       ""i_niin""
	   From i_niin.U:

	   This variable conditionally defines "I_NETINET_IN",
	   which indicates to the C program that it should
	   include <netinet/in.h>. Otherwise, you may try
	   <sys/in.h>.

       ""i_poll""
	   From i_poll.U:

	   This variable conditionally defines the "I_POLL"
	   symbol, and indicates whether a C program should
	   include <poll.h>.

       ""i_prot""
	   From i_prot.U:

	   This variable conditionally defines the "I_PROT" sym
	   bol, and indicates whether a C program should include
	   <prot.h>.

       ""i_pthread""
	   From i_pthread.U:

	   This variable conditionally defines the "I_PTHREAD"
	   symbol, and indicates whether a C program should
	   include <pthread.h>.

       ""i_pwd""
	   From i_pwd.U:

	   This variable conditionally defines "I_PWD", which
	   indicates to the C program that it should include
	   <pwd.h>.

       ""i_rpcsvcdbm""
	   From i_dbm.U:

	   This variable conditionally defines the "I_RPCSVC_DBM"
	   symbol, which indicates to the C program that
	   <rpcsvc/dbm.h> exists and should be included.  Some
	   System V systems might need this instead of <dbm.h>.

       ""i_sfio""
	   From i_sfio.U:

	   This variable conditionally defines the "I_SFIO" sym
	   bol, and indicates whether a C program should include
	   <sfio.h>.

       ""i_sgtty""
	   From i_termio.U:

	   This variable conditionally defines the "I_SGTTY" sym
	   bol, which indicates to the C program that it should
	   include <sgtty.h> rather than <termio.h>.

       ""i_shadow""
	   From i_shadow.U:

	   This variable conditionally defines the "I_SHADOW"
	   symbol, and indicates whether a C program should
	   include <shadow.h>.

       ""i_socks""
	   From i_socks.U:

	   This variable conditionally defines the "I_SOCKS" sym
	   bol, and indicates whether a C program should include
	   <socks.h>.

       ""i_stdarg""
	   From i_varhdr.U:

	   This variable conditionally defines the "I_STDARG"
	   symbol, which indicates to the C program that
	   <stdarg.h> exists and should be included.

       ""i_stddef""
	   From i_stddef.U:

	   This variable conditionally defines the "I_STDDEF"
	   symbol, which indicates to the C program that <std
	   def.h> exists and should be included.

       ""i_stdlib""
	   From i_stdlib.U:

	   This variable conditionally defines the "I_STDLIB"
	   symbol, which indicates to the C program that
	   <stdlib.h> exists and should be included.

       ""i_string""
	   From i_string.U:

	   This variable conditionally defines the "I_STRING"
	   symbol, which indicates that <string.h> should be
	   included rather than <strings.h>.

       ""i_sunmath""
	   From i_sunmath.U:

	   This variable conditionally defines the "I_SUNMATH"
	   symbol, and indicates whether a C program should
	   include <sunmath.h>.

       ""i_sysaccess""
	   From i_sysaccess.U:

	   This variable conditionally defines the "I_SYS_ACCESS"
	   symbol, and indicates whether a C program should
	   include <sys/access.h>.

       ""i_sysdir""
	   From i_sysdir.U:

	   This variable conditionally defines the "I_SYS_DIR"
	   symbol, and indicates whether a C program should
	   include <sys/dir.h>.

       ""i_sysfile""
	   From i_sysfile.U:

	   This variable conditionally defines the "I_SYS_FILE"
	   symbol, and indicates whether a C program should
	   include <sys/file.h> to get "R_OK" and friends.

       ""i_sysfilio""
	   From i_sysioctl.U:

	   This variable conditionally defines the "I_SYS_FILIO"
	   symbol, which indicates to the C program that
	   <sys/filio.h> exists and should be included in prefer
	   ence to <sys/ioctl.h>.

       ""i_sysin""
	   From i_niin.U:

	   This variable conditionally defines "I_SYS_IN", which
	   indicates to the C program that it should include
	   <sys/in.h> instead of <netinet/in.h>.

       ""i_sysioctl""
	   From i_sysioctl.U:

	   This variable conditionally defines the "I_SYS_IOCTL"
	   symbol, which indicates to the C program that
	   <sys/ioctl.h> exists and should be included.

       ""i_syslog""
	   From i_syslog.U:

	   This variable conditionally defines the "I_SYSLOG"
	   symbol, and indicates whether a C program should
	   include <syslog.h>.

       ""i_sysmman""
	   From i_sysmman.U:

	   This variable conditionally defines the "I_SYS_MMAN"
	   symbol, and indicates whether a C program should
	   include <sys/mman.h>.

       ""i_sysmode""
	   From i_sysmode.U:

	   This variable conditionally defines the "I_SYSMODE"
	   symbol, and indicates whether a C program should
	   include <sys/mode.h>.

       ""i_sysmount""
	   From i_sysmount.U:

	   This variable conditionally defines the "I_SYSMOUNT"
	   symbol, and indicates whether a C program should
	   include <sys/mount.h>.

       ""i_sysndir""
	   From i_sysndir.U:

	   This variable conditionally defines the "I_SYS_NDIR"
	   symbol, and indicates whether a C program should
	   include <sys/ndir.h>.

       ""i_sysparam""
	   From i_sysparam.U:

	   This variable conditionally defines the "I_SYS_PARAM"
	   symbol, and indicates whether a C program should
	   include <sys/param.h>.

       ""i_sysresrc""
	   From i_sysresrc.U:

	   This variable conditionally defines the
	   "I_SYS_RESOURCE" symbol, and indicates whether a C
	   program should include <sys/resource.h>.

       ""i_syssecrt""
	   From i_syssecrt.U:

	   This variable conditionally defines the "I_SYS_SECU
	   RITY" symbol, and indicates whether a C program should
	   include <sys/security.h>.

       ""i_sysselct""
	   From i_sysselct.U:

	   This variable conditionally defines "I_SYS_SELECT",
	   which indicates to the C program that it should
	   include <sys/select.h> in order to get the definition
	   of struct timeval.

       ""i_syssockio""
	   From i_sysioctl.U:

	   This variable conditionally defines "I_SYS_SOCKIO" to
	   indicate to the C program that socket ioctl codes may
	   be found in <sys/sockio.h> instead of <sys/ioctl.h>.

       ""i_sysstat""
	   From i_sysstat.U:

	   This variable conditionally defines the "I_SYS_STAT"
	   symbol, and indicates whether a C program should
	   include <sys/stat.h>.

       ""i_sysstatfs""
	   From i_sysstatfs.U:

	   This variable conditionally defines the "I_SYSSTATFS"
	   symbol, and indicates whether a C program should
	   include <sys/statfs.h>.

       ""i_sysstatvfs""
	   From i_sysstatvfs.U:

	   This variable conditionally defines the "I_SYSSTATVFS"
	   symbol, and indicates whether a C program should
	   include <sys/statvfs.h>.

       ""i_systime""
	   From i_time.U:

	   This variable conditionally defines "I_SYS_TIME",
	   which indicates to the C program that it should
	   include <sys/time.h>.

       ""i_systimek""
	   From i_time.U:

	   This variable conditionally defines "I_SYS_TIME_KER
	   NEL", which indicates to the C program that it should
	   include <sys/time.h> with "KERNEL" defined.

       ""i_systimes""
	   From i_systimes.U:

	   This variable conditionally defines the "I_SYS_TIMES"
	   symbol, and indicates whether a C program should
	   include <sys/times.h>.

       ""i_systypes""
	   From i_systypes.U:

	   This variable conditionally defines the "I_SYS_TYPES"
	   symbol, and indicates whether a C program should
	   include <sys/types.h>.

       ""i_sysuio""
	   From i_sysuio.U:

	   This variable conditionally defines the "I_SYSUIO"
	   symbol, and indicates whether a C program should
	   include <sys/uio.h>.

       ""i_sysun""
	   From i_sysun.U:

	   This variable conditionally defines "I_SYS_UN", which
	   indicates to the C program that it should include
	   <sys/un.h> to get "UNIX" domain socket definitions.

       ""i_sysutsname""
	   From i_sysutsname.U:

	   This variable conditionally defines the "I_SYSUTSNAME"
	   symbol, and indicates whether a C program should
	   include <sys/utsname.h>.

       ""i_sysvfs""
	   From i_sysvfs.U:

	   This variable conditionally defines the "I_SYSVFS"
	   symbol, and indicates whether a C program should
	   include <sys/vfs.h>.

       ""i_syswait""
	   From i_syswait.U:

	   This variable conditionally defines "I_SYS_WAIT",
	   which indicates to the C program that it should
	   include <sys/wait.h>.

       ""i_termio""
	   From i_termio.U:

	   This variable conditionally defines the "I_TERMIO"
	   symbol, which indicates to the C program that it
	   should include <termio.h> rather than <sgtty.h>.

       ""i_termios""
	   From i_termio.U:

	   This variable conditionally defines the "I_TERMIOS"
	   symbol, which indicates to the C program that the
	   "POSIX" <termios.h> file is to be included.

       ""i_time""
	   From i_time.U:

	   This variable conditionally defines "I_TIME", which
	   indicates to the C program that it should include
	   <time.h>.

       ""i_unistd""
	   From i_unistd.U:

	   This variable conditionally defines the "I_UNISTD"
	   symbol, and indicates whether a C program should
	   include <unistd.h>.

       ""i_ustat""
	   From i_ustat.U:

	   This variable conditionally defines the "I_USTAT" sym
	   bol, and indicates whether a C program should include
	   <ustat.h>.

       ""i_utime""
	   From i_utime.U:

	   This variable conditionally defines the "I_UTIME" sym
	   bol, and indicates whether a C program should include
	   <utime.h>.

       ""i_values""
	   From i_values.U:

	   This variable conditionally defines the "I_VALUES"
	   symbol, and indicates whether a C program may include
	   <values.h> to get symbols like "MAXLONG" and friends.

       ""i_varargs""
	   From i_varhdr.U:

	   This variable conditionally defines "I_VARARGS", which
	   indicates to the C program that it should include
	   <varargs.h>.

       ""i_varhdr""
	   From i_varhdr.U:

	   Contains the name of the header to be included to get
	   va_dcl definition.  Typically one of varargs.h or
	   stdarg.h.

       ""i_vfork""
	   From i_vfork.U:

	   This variable conditionally defines the "I_VFORK" sym
	   bol, and indicates whether a C program should include
	   vfork.h.

       ""ignore_versioned_solibs""
	   From libs.U:

	   This variable should be non-empty if non-versioned
	   shared libraries (libfoo.so.x.y) are to be ignored
	   (because they cannot be linked against).

       ""inc_version_list""
	   From inc_version_list.U:

	   This variable specifies the list of subdirectories in
	   over which perl.c:incpush() and lib/lib.pm will auto
	   matically search when adding directories to @"INC".
	   The elements in the list are separated by spaces.
	   This is only useful if you have a perl library direc
	   tory tree structured like the default one.  See
	   "INSTALL" for how this works.  The versioned site_perl
	   directory was introduced in 5.005, so that is the low
	   est possible value.

       ""inc_version_list_init""
	   From inc_version_list.U:

	   This variable holds the same list as inc_version_list,
	   but each item is enclosed in double quotes and sepa
	   rated by commas, suitable for use in the
	   "PERL_INC_VERSION_LIST" initialization.

       ""incpath""
	   From usrinc.U:

	   This variable must preceed the normal include path to
	   get hte right one, as in $incpath/usr/include or $inc_
	   path/usr/lib.  Value can be "" or /bsd43 on mips.

       ""inews""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""installarchlib""
	   From archlib.U:

	   This variable is really the same as archlibexp but may
	   differ on those systems using "AFS". For extra porta
	   bility, only this variable should be used in make
	   files.

       ""installbin""
	   From bin.U:

	   This variable is the same as binexp unless "AFS" is
	   running in which case the user is explicitely prompted
	   for it. This variable should always be used in your
	   makefiles for maximum portability.

       ""installman1dir""
	   From man1dir.U:

	   This variable is really the same as man1direxp, unless
	   you are using "AFS" in which case it points to the
	   read/write location whereas man1direxp only points to
	   the read-only access location. For extra portability,
	   you should only use this variable within your make
	   files.

       ""installman3dir""
	   From man3dir.U:

	   This variable is really the same as man3direxp, unless
	   you are using "AFS" in which case it points to the
	   read/write location whereas man3direxp only points to
	   the read-only access location. For extra portability,
	   you should only use this variable within your make
	   files.

       ""installprefix""
	   From installprefix.U:

	   This variable holds the name of the directory below
	   which "make install" will install the package.  For
	   most users, this is the same as prefix.  However, it
	   is useful for installing the software into a different
	   (usually temporary) location after which it can be
	   bundled up and moved somehow to the final location
	   specified by prefix.

       ""installprefixexp""
	   From installprefix.U:

	   This variable holds the full absolute path of install
	   prefix with all ~-expansion done.

       ""installprivlib""
	   From privlib.U:

	   This variable is really the same as privlibexp but may
	   differ on those systems using "AFS". For extra porta
	   bility, only this variable should be used in make
	   files.

       ""installscript""
	   From scriptdir.U:

	   This variable is usually the same as scriptdirexp,
	   unless you are on a system running "AFS", in which
	   case they may differ slightly. You should always use
	   this variable within your makefiles for portability.

       ""installsitearch""
	   From sitearch.U:

	   This variable is really the same as sitearchexp but
	   may differ on those systems using "AFS". For extra
	   portability, only this variable should be used in
	   makefiles.

       ""installsitebin""
	   From sitebin.U:

	   This variable is usually the same as sitebinexp,
	   unless you are on a system running "AFS", in which
	   case they may differ slightly. You should always use
	   this variable within your makefiles for portability.

       ""installsitelib""
	   From sitelib.U:

	   This variable is really the same as sitelibexp but may
	   differ on those systems using "AFS". For extra porta
	   bility, only this variable should be used in make
	   files.

       ""installstyle""
	   From installstyle.U:

	   This variable describes the "style" of the perl
	   installation.  This is intended to be useful for tools
	   that need to manipulate entire perl distributions.
	   Perl itself doesn't use this to find its libraries --
	   the library directories are stored directly in Con_
	   fig.pm.  Currently, there are only two styles:  "lib"
	   and lib/perl5.  The default library locations (e.g.
	   privlib, sitelib) are either $prefix/lib or $pre_
	   fix/lib/perl5.  The former is useful if $prefix is a
	   directory dedicated to perl (e.g. /opt/perl), while
	   the latter is useful if $prefix is shared by many
	   packages, e.g. if $prefix=/usr/local.

		   This may later be extended to include other information, so

		   be careful with pattern-matching on the results.

		   For compatibility with F<perl5.005> and earlier, the default

		   setting is based on whether or not $prefix contains the string
	   C<perl>.

       ""installusrbinperl""
	   From instubperl.U:

	   This variable tells whether Perl should be installed
	   also as /usr/bin/perl in addition to $installbin/perl

       ""installvendorarch""
	   From vendorarch.U:

	   This variable is really the same as vendorarchexp but
	   may differ on those systems using "AFS". For extra
	   portability, only this variable should be used in
	   makefiles.

       ""installvendorbin""
	   From vendorbin.U:

	   This variable is really the same as vendorbinexp but
	   may differ on those systems using "AFS". For extra
	   portability, only this variable should be used in
	   makefiles.

       ""installvendorlib""
	   From vendorlib.U:

	   This variable is really the same as vendorlibexp but
	   may differ on those systems using "AFS". For extra
	   portability, only this variable should be used in
	   makefiles.

       ""intsize""
	   From intsize.U:

	   This variable contains the value of the "INTSIZE" sym
	   bol, which indicates to the C program how many bytes
	   there are in an int.

       ""issymlink""
	   From issymlink.U:

	   This variable holds the test command to test for a
	   symbolic link (if they are supported).  Typical values
	   include "test -h" and "test -L".

       ""ivdformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "IV" as a signed decimal integer.

       ""ivsize""
	   From perlxv.U:

	   This variable is the size of an "IV" in bytes.

       ""ivtype""
	   From perlxv.U:

	   This variable contains the C type used for Perl's
	   "IV".

       k

       ""known_extensions""
	   From Extensions.U:

	   This variable holds a list of all "XS" extensions
	   included in the package.

       ""ksh""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       l

       ""ld""
	   From dlsrc.U:

	   This variable indicates the program to be used to link
	   libraries for dynamic loading.  On some systems, it is
	   "ld".  On "ELF" systems, it should be $cc.  Mostly,
	   we'll try to respect the hint file setting.

       ""lddlflags""
	   From dlsrc.U:

	   This variable contains any special flags that might
	   need to be passed to $ld to create a shared library
	   suitable for dynamic loading.  It is up to the make
	   file to use it.  For hpux, it should be "-b".  For
	   sunos 4.1, it is empty.

       ""ldflags""
	   From ccflags.U:

	   This variable contains any additional C loader flags
	   desired by the user.	 It is up to the Makefile to use
	   this.

       ""ldflags_uselargefiles""
	   From uselfs.U:

	   This variable contains the loader flags needed by
	   large file builds and added to ldflags by hints files.

       ""ldlibpthname""
	   From libperl.U:

	   This variable holds the name of the shared library
	   search path, often "LD_LIBRARY_PATH".  To get an empty
	   string, the hints file must set this to "none".

       ""less""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the less pro
	   gram.  After Configure runs, the value is reset to a
	   plain "less" and is not useful.

       ""lib_ext""
	   From Unix.U:

	   This is an old synonym for _a.

       ""libc""
	   From libc.U:

	   This variable contains the location of the C library.

       ""libperl""
	   From libperl.U:

	   The perl executable is obtained by linking perlmain.c
	   with libperl, any static extensions (usually just
	   DynaLoader), and any other libraries needed on this
	   system.  libperl is usually libperl.a, but can also be
	   libperl.so.xxx if the user wishes to build a perl exe
	   cutable with a shared library.

       ""libpth""
	   From libpth.U:

	   This variable holds the general path (space-separated)
	   used to find libraries. It is intended to be used by
	   other units.

       ""libs""
	   From libs.U:

	   This variable holds the additional libraries we want
	   to use.  It is up to the Makefile to deal with it.

       ""libsdirs""
	   From libs.U:

	   This variable holds the directory names aka dirnames
	   of the libraries we found and accepted, duplicates are
	   removed.

       ""libsfiles""
	   From libs.U:

	   This variable holds the filenames aka basenames of the
	   libraries we found and accepted.

       ""libsfound""
	   From libs.U:

	   This variable holds the full pathnames of the
	   libraries we found and accepted.

       ""libspath""
	   From libs.U:

	   This variable holds the directory names probed for
	   libraries.

       ""libswanted""
	   From Myinit.U:

	   This variable holds a list of all the libraries we
	   want to search.  The order is chosen to pick up the c
	   library ahead of ucb or bsd libraries for SVR4.

       ""libswanted_uselargefiles""
	   From uselfs.U:

	   This variable contains the libraries needed by large
	   file builds and added to ldflags by hints files.  It
	   is a space separated list of the library names without
	   the "lib" prefix or any suffix, just like libswanted..

       ""line""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""lint""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""lkflags""
	   From ccflags.U:

	   This variable contains any additional C partial linker
	   flags desired by the user.  It is up to the Makefile
	   to use this.

       ""ln""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the ln pro
	   gram.  After Configure runs, the value is reset to a
	   plain "ln" and is not useful.

       ""lns""
	   From lns.U:

	   This variable holds the name of the command to make
	   symbolic links (if they are supported).  It can be
	   used in the Makefile. It is either "ln -s" or "ln"

       ""locincpth""
	   From ccflags.U:

	   This variable contains a list of additional directo
	   ries to be searched by the compiler.	 The appropriate
	   "-I" directives will be added to ccflags.  This is
	   intended to simplify setting local directories from
	   the Configure command line.	It's not much, but it
	   parallels the loclibpth stuff in libpth.U.

       ""loclibpth""
	   From libpth.U:

	   This variable holds the paths (space-separated) used
	   to find local libraries.  It is prepended to libpth,
	   and is intended to be easily set from the command
	   line.

       ""longdblsize""
	   From d_longdbl.U:

	   This variable contains the value of the "LONG_DOUBLE
	   SIZE" symbol, which indicates to the C program how
	   many bytes there are in a long double, if this system
	   supports long doubles.

       ""longlongsize""
	   From d_longlong.U:

	   This variable contains the value of the "LONGLONGSIZE"
	   symbol, which indicates to the C program how many
	   bytes there are in a long long, if this system sup
	   ports long long.

       ""longsize""
	   From intsize.U:

	   This variable contains the value of the "LONGSIZE"
	   symbol, which indicates to the C program how many
	   bytes there are in a long.

       ""lp""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""lpr""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""ls""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the ls pro
	   gram.  After Configure runs, the value is reset to a
	   plain "ls" and is not useful.

       ""lseeksize""
	   From lseektype.U:

	   This variable defines lseektype to be something like
	   off_t, long, or whatever type is used to declare lseek
	   offset's type in the kernel (which also appears to be
	   lseek's return type).

       ""lseektype""
	   From lseektype.U:

	   This variable defines lseektype to be something like
	   off_t, long, or whatever type is used to declare lseek
	   offset's type in the kernel (which also appears to be
	   lseek's return type).

       m

       ""mail""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""mailx""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""make""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the make pro
	   gram.  After Configure runs, the value is reset to a
	   plain "make" and is not useful.

       ""make_set_make""
	   From make.U:

	   Some versions of "make" set the variable "MAKE".  Oth
	   ers do not.	This variable contains the string to be
	   included in Makefile.SH so that "MAKE" is set if
	   needed, and not if not needed.  Possible values are:
	   make_set_make="#"	    # If your make program han
	   dles this for you, make_set_make="MAKE=$make"    # if
	   it doesn't.	I used a comment character so that we can
	   distinguish a "set" value (from a previous config.sh
	   or Configure "-D" option) from an uncomputed value.

       ""mallocobj""
	   From mallocsrc.U:

	   This variable contains the name of the malloc.o that
	   this package generates, if that malloc.o is preferred
	   over the system malloc.  Otherwise the value is null.
	   This variable is intended for generating Makefiles.
	   See mallocsrc.

       ""mallocsrc""
	   From mallocsrc.U:

	   This variable contains the name of the malloc.c that
	   comes with the package, if that malloc.c is preferred
	   over the system malloc.  Otherwise the value is null.
	   This variable is intended for generating Makefiles.

       ""malloctype""
	   From mallocsrc.U:

	   This variable contains the kind of ptr returned by
	   malloc and realloc.

       ""man1dir""
	   From man1dir.U:

	   This variable contains the name of the directory in
	   which manual source pages are to be put.  It is the
	   responsibility of the Makefile.SH to get the value of
	   this into the proper command.  You must be prepared to
	   do the ~name expansion yourself.

       ""man1direxp""
	   From man1dir.U:

	   This variable is the same as the man1dir variable, but
	   is filename expanded at configuration time, for conve
	   nient use in makefiles.

       ""man1ext""
	   From man1dir.U:

	   This variable contains the extension that the manual
	   page should have: one of "n", "l", or "1".  The Make
	   file must supply the ..  See man1dir.

       ""man3dir""
	   From man3dir.U:

	   This variable contains the name of the directory in
	   which manual source pages are to be put.  It is the
	   responsibility of the Makefile.SH to get the value of
	   this into the proper command.  You must be prepared to
	   do the ~name expansion yourself.

       ""man3direxp""
	   From man3dir.U:

	   This variable is the same as the man3dir variable, but
	   is filename expanded at configuration time, for conve
	   nient use in makefiles.

       ""man3ext""
	   From man3dir.U:

	   This variable contains the extension that the manual
	   page should have: one of "n", "l", or "3".  The Make
	   file must supply the ..  See man3dir.

       M

       ""Mcc""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the Mcc pro
	   gram.  After Configure runs, the value is reset to a
	   plain "Mcc" and is not useful.

       ""mips_type""
	   From usrinc.U:

	   This variable holds the environment type for the mips
	   system.  Possible values are "BSD 4.3" and "System V".

       ""mkdir""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the mkdir pro
	   gram.  After Configure runs, the value is reset to a
	   plain "mkdir" and is not useful.

       ""mmaptype""
	   From d_mmap.U:

	   This symbol contains the type of pointer returned by
	   mmap() (and simultaneously the type of the first argu
	   ment).  It can be "void *" or "caddr_t".

       ""modetype""
	   From modetype.U:

	   This variable defines modetype to be something like
	   mode_t, int, unsigned short, or whatever type is used
	   to declare file modes for system calls.

       ""more""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the more pro
	   gram.  After Configure runs, the value is reset to a
	   plain "more" and is not useful.

       ""multiarch""
	   From multiarch.U:

	   This variable conditionally defines the "MULTIARCH"
	   symbol which signifies the presence of multiplatform
	   files.  This is normally set by hints files.

       ""mv""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""myarchname""
	   From archname.U:

	   This variable holds the architecture name computed by
	   Configure in a previous run. It is not intended to be
	   perused by any user and should never be set in a hint
	   file.

       ""mydomain""
	   From myhostname.U:

	   This variable contains the eventual value of the
	   "MYDOMAIN" symbol, which is the domain of the host the
	   program is going to run on.	The domain must be
	   appended to myhostname to form a complete host name.
	   The dot comes with mydomain, and need not be supplied
	   by the program.

       ""myhostname""
	   From myhostname.U:

	   This variable contains the eventual value of the
	   "MYHOSTNAME" symbol, which is the name of the host the
	   program is going to run on.	The domain is not kept
	   with hostname, but must be gotten from mydomain.  The
	   dot comes with mydomain, and need not be supplied by
	   the program.

       ""myuname""
	   From Oldconfig.U:

	   The output of "uname -a" if available, otherwise the
	   hostname. On Xenix, pseudo variables assignments in
	   the output are stripped, thank you. The whole thing is
	   then lower-cased.

       n

       ""n""
	   From n.U:

	   This variable contains the "-n" flag if that is what
	   causes the echo command to suppress newline.	 Other
	   wise it is null.  Correct usage is $echo $n "prompt
	   for a question: $c".

       ""need_va_copy""
	   From need_va_copy.U:

	   This symbol, if defined, indicates that the system
	   stores the variable argument list datatype, va_list,
	   in a format that cannot be copied by simple assign
	   ment, so that some other means must be used when copy
	   ing is required.  As such systems vary in their
	   provision (or non-provision) of copying mechanisms,
	   handy.h defines a platform- "independent" macro,
	   Perl_va_copy(src, dst), to do the job.

       ""netdb_hlen_type""
	   From netdbtype.U:

	   This variable holds the type used for the 2nd argument
	   to gethostbyaddr().	Usually, this is int or size_t or
	   unsigned.  This is only useful if you have gethost_
	   byaddr(), naturally.

       ""netdb_host_type""
	   From netdbtype.U:

	   This variable holds the type used for the 1st argument
	   to gethostbyaddr().	Usually, this is char * or void
	   *,  possibly with or without a const prefix.	 This is
	   only useful if you have gethostbyaddr(), naturally.

       ""netdb_name_type""
	   From netdbtype.U:

	   This variable holds the type used for the argument to
	   gethostbyname().  Usually, this is char * or const
	   char *.  This is only useful if you have gethostby_
	   name(), naturally.

       ""netdb_net_type""
	   From netdbtype.U:

	   This variable holds the type used for the 1st argument
	   to getnetbyaddr().  Usually, this is int or long.
	   This is only useful if you have getnetbyaddr(), natu
	   rally.

       ""nm""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the nm pro
	   gram.  After Configure runs, the value is reset to a
	   plain "nm" and is not useful.

       ""nm_opt""
	   From usenm.U:

	   This variable holds the options that may be necessary
	   for nm.

       ""nm_so_opt""
	   From usenm.U:

	   This variable holds the options that may be necessary
	   for nm to work on a shared library but that can not be
	   used on an archive library.	Currently, this is only
	   used by Linux, where nm --dynamic is *required* to get
	   symbols from an "ELF" library which has been stripped,
	   but nm --dynamic is *fatal* on an archive library.
	   Maybe Linux should just always set usenm=false.

       ""nonxs_ext""
	   From Extensions.U:

	   This variable holds a list of all non-xs extensions
	   included in the package.  All of them will be built.

       ""nroff""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the nroff pro
	   gram.  After Configure runs, the value is reset to a
	   plain "nroff" and is not useful.

       ""nveformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "NV" using %e-ish floating point for
	   mat.

       ""nvEUformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "NV" using %E-ish floating point for
	   mat.

       ""nvfformat""
	   From perlxvf.U:

	   This variable confains the format string used for
	   printing a Perl "NV" using %f-ish floating point for
	   mat.

       ""nvFUformat""
	   From perlxvf.U:

	   This variable confains the format string used for
	   printing a Perl "NV" using %F-ish floating point for
	   mat.

       ""nvgformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "NV" using %g-ish floating point for
	   mat.

       ""nvGUformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "NV" using %G-ish floating point for
	   mat.

       ""nvsize""
	   From perlxv.U:

	   This variable is the size of an "NV" in bytes.

       ""nvtype""
	   From perlxv.U:

	   This variable contains the C type used for Perl's
	   "NV".

       o

       ""o_nonblock""
	   From nblock_io.U:

	   This variable bears the symbol value to be used during
	   open() or fcntl() to turn on non-blocking I/O for a
	   file descriptor. If you wish to switch between block
	   ing and non-blocking, you may try ioctl("FIOSNBIO")
	   instead, but that is only supported by some devices.

       ""obj_ext""
	   From Unix.U:

	   This is an old synonym for _o.

       ""old_pthread_create_joinable""
	   From d_pthrattrj.U:

	   This variable defines the constant to use for creating
	   joinable (aka undetached) pthreads.	Unused if
	   pthread.h defines "PTHREAD_CREATE_JOINABLE".	 If used,
	   possible values are "PTHREAD_CREATE_UNDETACHED" and
	   "__UNDETACHED".

       ""optimize""
	   From ccflags.U:

	   This variable contains any optimizer/debugger flag
	   that should be used.	 It is up to the Makefile to use
	   it.

       ""orderlib""
	   From orderlib.U:

	   This variable is "true" if the components of libraries
	   must be ordered (with `lorder $* | tsort`) before
	   placing them in an archive.	Set to "false" if ranlib
	   or ar can generate random libraries.

       ""osname""
	   From Oldconfig.U:

	   This variable contains the operating system name (e.g.
	   sunos, solaris, hpux, etc.).	 It can be useful later
	   on for setting defaults.  Any spaces are replaced with
	   underscores.	 It is set to a null string if we can't
	   figure it out.

       ""osvers""
	   From Oldconfig.U:

	   This variable contains the operating system version
	   (e.g.  4.1.3, 5.2, etc.).  It is primarily used for
	   helping select an appropriate hints file, but might be
	   useful elsewhere for setting defaults.  It is set to
	   '' if we can't figure it out.  We try to be flexible
	   about how much of the version number to keep, e.g. if
	   4.1.1, 4.1.2, and 4.1.3 are essentially the same for
	   this package, hints files might just be os_4.0 or
	   os_4.1, etc., not keeping separate files for each lit
	   tle release.

       ""otherlibdirs""
	   From otherlibdirs.U:

	   This variable contains a colon-separated set of paths
	   for the perl binary to search for additional library
	   files or modules.  These directories will be tacked to
	   the end of @"INC".  Perl will automatically search
	   below each path for version- and architecture-specific
	   directories.	 See inc_version_list for more details.
	   A value of " " means "none" and is used to preserve
	   this value for the next run through Configure.

       p

       ""package""
	   From package.U:

	   This variable contains the name of the package being
	   constructed.	 It is primarily intended for the use of
	   later Configure units.

       ""pager""
	   From pager.U:

	   This variable contains the name of the preferred pager
	   on the system.  Usual values are (the full pathnames
	   of) more, less, pg, or cat.

       ""passcat""
	   From nis.U:

	   This variable contains a command that produces the
	   text of the /etc/passwd file.  This is normally "cat
	   /etc/passwd", but can be "ypcat passwd" when "NIS" is
	   used.  On some systems, such as os390, there may be no
	   equivalent command, in which case this variable is
	   unset.

       ""patchlevel""
	   From patchlevel.U:

	   The patchlevel level of this package.  The value of
	   patchlevel comes from the patchlevel.h file.	 In a
	   version number such as 5.6.1, this is the "6".  In
	   patchlevel.h, this is referred to as "PERL_VERSION".

       ""path_sep""
	   From Unix.U:

	   This is an old synonym for p_ in Head.U, the character
	   used to separate elements in the command shell search
	   "PATH".

       ""perl5""
	   From perl5.U:

	   This variable contains the full path (if any) to a
	   previously installed perl5.005 or later suitable for
	   running the script to determine inc_version_list.

       ""perl""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       P

       ""PERL_REVISION""
	   From Oldsyms.U:

	   In a Perl version number such as 5.6.2, this is the 5.
	   This value is manually set in patchlevel.h

       ""PERL_SUBVERSION""
	   From Oldsyms.U:

	   In a Perl version number such as 5.6.2, this is the 2.
	   Values greater than 50 represent potentially unstable
	   development subversions.  This value is manually set
	   in patchlevel.h

       ""PERL_VERSION""
	   From Oldsyms.U:

	   In a Perl version number such as 5.6.2, this is the 6.
	   This value is manually set in patchlevel.h

       ""perladmin""
	   From perladmin.U:

	   Electronic mail address of the perl5 administrator.

       ""perllibs""
	   From End.U:

	   The list of libraries needed by Perl only (any
	   libraries needed by extensions only will by dropped,
	   if using dynamic loading).

       ""perlpath""
	   From perlpath.U:

	   This variable contains the eventual value of the
	   "PERLPATH" symbol, which contains the name of the perl
	   interpreter to be used in shell scripts and in the
	   "eval "exec"" idiom.

       ""pg""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the pg pro
	   gram.  After Configure runs, the value is reset to a
	   plain "pg" and is not useful.

       ""phostname""
	   From myhostname.U:

	   This variable contains the eventual value of the
	   "PHOSTNAME" symbol, which is a command that can be fed
	   to popen() to get the host name.  The program should
	   probably not presume that the domain is or isn't there
	   already.

       ""pidtype""
	   From pidtype.U:

	   This variable defines "PIDTYPE" to be something like
	   pid_t, int, ushort, or whatever type is used to
	   declare process ids in the kernel.

       ""plibpth""
	   From libpth.U:

	   Holds the private path used by Configure to find out
	   the libraries.  Its value is prepend to libpth. This
	   variable takes care of special machines, like the
	   mips.  Usually, it should be empty.

       ""pm_apiversion""
	   From xs_apiversion.U:

	   This variable contains the version of the oldest perl
	   compatible with the present perl.  (That is, pure perl
	   modules written for $pm_apiversion will still work for
	   the current version).  perl.c:incpush() and lib/lib.pm
	   will automatically search in $sitelib for older direc
	   tories across major versions back to pm_apiversion.
	   This is only useful if you have a perl library direc
	   tory tree structured like the default one.  The ver
	   sioned site_perl library was introduced in 5.005, so
	   that's the default setting for this variable.  It's
	   hard to imagine it changing before Perl6.  It is
	   included here for symmetry with xs_apiveprsion -- the
	   searching algorithms will (presumably) be similar.
	   See the "INSTALL" file for how this works.

       ""pmake""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""pr""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""prefix""
	   From prefix.U:

	   This variable holds the name of the directory below
	   which the user will install the package.  Usually,
	   this is /usr/local, and executables go in
	   /usr/local/bin, library stuff in /usr/local/lib, man
	   pages in /usr/local/man, etc.  It is only used to set
	   defaults for things in bin.U, mansrc.U, privlib.U, or
	   scriptdir.U.

       ""prefixexp""
	   From prefix.U:

	   This variable holds the full absolute path of the
	   directory below which the user will install the pack
	   age.	 Derived from prefix.

       ""privlib""
	   From privlib.U:

	   This variable contains the eventual value of the
	   "PRIVLIB" symbol, which is the name of the private
	   library for this package.  It may have a ~ on the
	   front. It is up to the makefile to eventually create
	   this directory while performing installation (with ~
	   substitution).

       ""privlibexp""
	   From privlib.U:

	   This variable is the ~name expanded version of
	   privlib, so that you may use it directly in Makefiles
	   or shell scripts.

       ""prototype""
	   From prototype.U:

	   This variable holds the eventual value of "CAN_PROTO
	   TYPE", which indicates the C compiler can handle
	   funciton prototypes.

       ""ptrsize""
	   From ptrsize.U:

	   This variable contains the value of the "PTRSIZE" sym
	   bol, which indicates to the C program how many bytes
	   there are in a pointer.

       q

       ""quadkind""
	   From quadtype.U:

	   This variable, if defined, encodes the type of a quad:
	   1 = int, 2 = long, 3 = long long, 4 = int64_t.

       ""quadtype""
	   From quadtype.U:

	   This variable defines Quad_t to be something like
	   long, int, long long, int64_t, or whatever type is
	   used for 64-bit integers.

       r

       ""randbits""
	   From randfunc.U:

	   Indicates how many bits are produced by the function
	   used to generate normalized random numbers.

       ""randfunc""
	   From randfunc.U:

	   Indicates the name of the random number function to
	   use.	 Values include drand48, random, and rand. In C
	   programs, the "Drand01" macro is defined to generate
	   uniformly distributed random numbers over the range
	   [0., 1.[ (see drand01 and nrand).

       ""randseedtype""
	   From randfunc.U:

	   Indicates the type of the argument of the seedfunc.

       ""ranlib""
	   From orderlib.U:

	   This variable is set to the pathname of the ranlib
	   program, if it is needed to generate random libraries.
	   Set to ":" if ar can generate random libraries or if
	   random libraries are not supported

       ""rd_nodata""
	   From nblock_io.U:

	   This variable holds the return code from read() when
	   no data is present. It should be -1, but some systems
	   return 0 when "O_NDELAY" is used, which is a shame
	   because you cannot make the difference between no data
	   and an EOF.. Sigh!

       ""revision""
	   From patchlevel.U:

	   The value of revision comes from the patchlevel.h
	   file.  In a version number such as 5.6.1, this is the
	   "5".	 In patchlevel.h, this is referred to as
	   "PERL_REVISION".

       ""rm""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the rm pro
	   gram.  After Configure runs, the value is reset to a
	   plain "rm" and is not useful.

       ""rmail""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""runnm""
	   From usenm.U:

	   This variable contains "true" or "false" depending
	   whether the nm extraction should be performed or not,
	   according to the value of usenm and the flags on the
	   Configure command line.

       s

       ""sched_yield""
	   From d_pthread_y.U:

	   This variable defines the way to yield the execution
	   of the current thread.

       ""scriptdir""
	   From scriptdir.U:

	   This variable holds the name of the directory in which
	   the user wants to put publicly scripts for the package
	   in question.	 It is either the same directory as for
	   binaries, or a special one that can be mounted across
	   different architectures, like /usr/share. Programs
	   must be prepared to deal with ~name expansion.

       ""scriptdirexp""
	   From scriptdir.U:

	   This variable is the same as scriptdir, but is
	   filename expanded at configuration time, for programs
	   not wanting to bother with it.

       ""sed""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the sed pro
	   gram.  After Configure runs, the value is reset to a
	   plain "sed" and is not useful.

       ""seedfunc""
	   From randfunc.U:

	   Indicates the random number generating seed function.
	   Values include srand48, srandom, and srand.

       ""selectminbits""
	   From selectminbits.U:

	   This variable holds the minimum number of bits oper
	   ated by select.  That is, if you do select(n, ...),
	   how many bits at least will be cleared in the masks if
	   some activity is detected.  Usually this is either n
	   or 32*ceil(n/32), especially many little-endians do
	   the latter.	This is only useful if you have select(),
	   naturally.

       ""selecttype""
	   From selecttype.U:

	   This variable holds the type used for the 2nd, 3rd,
	   and 4th arguments to select.	 Usually, this is "fd_set
	   *", if "HAS_FD_SET" is defined, and "int *" otherwise.
	   This is only useful if you have select(), naturally.

       ""sendmail""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""sh""
	   From sh.U:

	   This variable contains the full pathname of the shell
	   used on this system to execute Bourne shell scripts.
	   Usually, this will be /bin/sh, though it's possible
	   that some systems will have /bin/ksh, /bin/pdksh,
	   /bin/ash, /bin/bash, or even something such as
	   D:/bin/sh.exe.  This unit comes before Options.U, so
	   you can't set sh with a "-D" option, though you can
	   override this (and startsh) with "-O -Dsh=/bin/what
	   ever -Dstartsh=whatever"

       ""shar""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""sharpbang""
	   From spitshell.U:

	   This variable contains the string #! if this system
	   supports that construct.

       ""shmattype""
	   From d_shmat.U:

	   This symbol contains the type of pointer returned by
	   shmat().  It can be "void *" or "char *".

       ""shortsize""
	   From intsize.U:

	   This variable contains the value of the "SHORTSIZE"
	   symbol which indicates to the C program how many bytes
	   there are in a short.

       ""shrpenv""
	   From libperl.U:

	   If the user builds a shared libperl.so, then we need
	   to tell the "perl" executable where it will be able to
	   find the installed libperl.so.  One way to do this on
	   some systems is to set the environment variable
	   "LD_RUN_PATH" to the directory that will be the final
	   location of the shared libperl.so.  The makefile can
	   use this with something like $shrpenv $("CC") -o perl
	   perlmain.o $libperl $libs Typical values are
	   shrpenv="env "LD_RUN_PATH"=$archlibexp/"CORE"" or
	   shrpenv='' See the main perl Makefile.SH for actual
	   working usage.  Alternatively, we might be able to use
	   a command line option such as -R $archlibexp/"CORE"
	   (Solaris, NetBSD) or -Wl,-rpath $archlibexp/"CORE"
	   (Linux).

       ""shsharp""
	   From spitshell.U:

	   This variable tells further Configure units whether
	   your sh can handle # comments.

       ""sig_count""
	   From sig_name.U:

	   This variable holds a number larger than the largest
	   valid signal number.	 This is usually the same as the
	   "NSIG" macro.

       ""sig_name""
	   From sig_name.U:

	   This variable holds the signal names, space separated.
	   The leading "SIG" in signal name is removed.	 A "ZERO"
	   is prepended to the list.  This is currently not used.

       ""sig_name_init""
	   From sig_name.U:

	   This variable holds the signal names, enclosed in dou
	   ble quotes and separated by commas, suitable for use
	   in the "SIG_NAME" definition below.	A "ZERO" is
	   prepended to the list, and the list is terminated with
	   a plain 0.  The leading "SIG" in signal names is
	   removed. See sig_num.

       ""sig_num""
	   From sig_name.U:

	   This variable holds the signal numbers, space
	   separated. A "ZERO" is prepended to the list (corre
	   sponding to the fake "SIGZERO"), and the list is ter
	   minated with a 0.  Those numbers correspond to the
	   value of the signal listed in the same place within
	   the sig_name list.

       ""sig_num_init""
	   From sig_name.U:

	   This variable holds the signal numbers, enclosed in
	   double quotes and separated by commas, suitable for
	   use in the "SIG_NUM" definition below.  A "ZERO" is
	   prepended to the list, and the list is terminated with
	   a plain 0.

       ""sig_size""
	   From sig_name.U:

	   This variable contains the number of elements of the
	   sig_name and sig_num arrays, excluding the final
	   "NULL" entry.

       ""signal_t""
	   From d_voidsig.U:

	   This variable holds the type of the signal handler
	   (void or int).

       ""sitearch""
	   From sitearch.U:

	   This variable contains the eventual value of the
	   "SITEARCH" symbol, which is the name of the private
	   library for this package.  It may have a ~ on the
	   front. It is up to the makefile to eventually create
	   this directory while performing installation (with ~
	   substitution).  The standard distribution will put
	   nothing in this directory.  After perl has been
	   installed, users may install their own local architec
	   ture-dependent modules in this directory with Make
	   Maker Makefile.PL or equivalent.  See "INSTALL" for
	   details.

       ""sitearchexp""
	   From sitearch.U:

	   This variable is the ~name expanded version of
	   sitearch, so that you may use it directly in Makefiles
	   or shell scripts.

       ""sitebin""
	   From sitebin.U:

	   This variable holds the name of the directory in which
	   the user wants to put add-on publicly executable files
	   for the package in question.	 It is most often a local
	   directory such as /usr/local/bin. Programs using this
	   variable must be prepared to deal with ~name substitu
	   tion.  The standard distribution will put nothing in
	   this directory.  After perl has been installed, users
	   may install their own local executables in this direc
	   tory with MakeMaker Makefile.PL or equivalent.  See
	   "INSTALL" for details.

       ""sitebinexp""
	   From sitebin.U:

	   This is the same as the sitebin variable, but is file
	   name expanded at configuration time, for use in your
	   makefiles.

       ""sitelib""
	   From sitelib.U:

	   This variable contains the eventual value of the
	   "SITELIB" symbol, which is the name of the private
	   library for this package.  It may have a ~ on the
	   front. It is up to the makefile to eventually create
	   this directory while performing installation (with ~
	   substitution).  The standard distribution will put
	   nothing in this directory.  After perl has been
	   installed, users may install their own local architec
	   ture-independent modules in this directory with Make
	   Maker Makefile.PL or equivalent.  See "INSTALL" for
	   details.

       ""sitelib_stem""
	   From sitelib.U:

	   This variable is $sitelibexp with any trailing ver
	   sion-specific component removed.  The elements in
	   inc_version_list (inc_version_list.U) can be tacked
	   onto this variable to generate a list of directories
	   to search.

       ""sitelibexp""
	   From sitelib.U:

	   This variable is the ~name expanded version of
	   sitelib, so that you may use it directly in Makefiles
	   or shell scripts.

       ""siteprefix""
	   From siteprefix.U:

	   This variable holds the full absolute path of the
	   directory below which the user will install add-on
	   packages.  See "INSTALL" for usage and examples.

       ""siteprefixexp""
	   From siteprefix.U:

	   This variable holds the full absolute path of the
	   directory below which the user will install add-on
	   packages.  Derived from siteprefix.

       ""sizesize""
	   From sizesize.U:

	   This variable contains the size of a sizetype in
	   bytes.

       ""sizetype""
	   From sizetype.U:

	   This variable defines sizetype to be something like
	   size_t, unsigned long, or whatever type is used to
	   declare length parameters for string functions.

       ""sleep""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""smail""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""so""
	   From so.U:

	   This variable holds the extension used to identify
	   shared libraries (also known as shared objects) on the
	   system. Usually set to "so".

       ""sockethdr""
	   From d_socket.U:

	   This variable has any cpp "-I" flags needed for socket
	   support.

       ""socketlib""
	   From d_socket.U:

	   This variable has the names of any libraries needed
	   for socket support.

       ""socksizetype""
	   From socksizetype.U:

	   This variable holds the type used for the size argu
	   ment for various socket calls like accept.  Usual val
	   ues include socklen_t, size_t, and int.

       ""sort""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the sort pro
	   gram.  After Configure runs, the value is reset to a
	   plain "sort" and is not useful.

       ""spackage""
	   From package.U:

	   This variable contains the name of the package being
	   constructed, with the first letter uppercased, i.e.
	   suitable for starting sentences.

       ""spitshell""
	   From spitshell.U:

	   This variable contains the command necessary to spit
	   out a runnable shell on this system.	 It is either cat
	   or a grep "-v" for # comments.

       ""sPRId64""
	   From quadfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format 64-bit decimal numbers (format "d")
	   for output.

       ""sPRIeldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "e") for output.

       ""sPRIEUldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "E") for output.
	   The "U" in the name is to separate this from sPRIeldbl
	   so that even case-blind systems can see the differ
	   ence.

       ""sPRIfldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "f") for output.

       ""sPRIFUldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "F") for output.
	   The "U" in the name is to separate this from sPRIfldbl
	   so that even case-blind systems can see the differ
	   ence.

       ""sPRIgldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "g") for output.

       ""sPRIGUldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "G") for output.
	   The "U" in the name is to separate this from sPRIgldbl
	   so that even case-blind systems can see the differ
	   ence.

       ""sPRIi64""
	   From quadfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format 64-bit decimal numbers (format "i")
	   for output.

       ""sPRIo64""
	   From quadfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format 64-bit octal numbers (format "o") for
	   output.

       ""sPRIu64""
	   From quadfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format 64-bit unsigned decimal numbers (for
	   mat "u") for output.

       ""sPRIx64""
	   From quadfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format 64-bit hexadecimal numbers (format
	   "x") for output.

       ""sPRIXU64""
	   From quadfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format 64-bit hExADECimAl numbers (format
	   "X") for output.  The "U" in the name is to separate
	   this from sPRIx64 so that even case-blind systems can
	   see the difference.

       ""src""
	   From src.U:

	   This variable holds the path to the package source. It
	   is up to the Makefile to use this variable and set
	   "VPATH" accordingly to find the sources remotely.

       ""sSCNfldbl""
	   From longdblfio.U:

	   This variable, if defined, contains the string used by
	   stdio to format long doubles (format "f") for input.

       ""ssizetype""
	   From ssizetype.U:

	   This variable defines ssizetype to be something like
	   ssize_t, long or int.  It is used by functions that
	   return a count of bytes or an error condition.  It
	   must be a signed type.  We will pick a type such that
	   sizeof(SSize_t) == sizeof(Size_t).

       ""startperl""
	   From startperl.U:

	   This variable contains the string to put on the front
	   of a perl script to make sure (hopefully) that it runs
	   with perl and not some shell. Of course, that leading
	   line must be followed by the classical perl idiom:
	   eval 'exec perl -S $0 ${1+"$@"}' if $run
	   ning_under_some_shell; to guarantee perl startup
	   should the shell execute the script. Note that this
	   magic incatation is not understood by csh.

       ""startsh""
	   From startsh.U:

	   This variable contains the string to put on the front
	   of a shell script to make sure (hopefully) that it
	   runs with sh and not some other shell.

       ""static_ext""
	   From Extensions.U:

	   This variable holds a list of "XS" extension files we
	   want to link statically into the package.  It is used
	   by Makefile.

       ""stdchar""
	   From stdchar.U:

	   This variable conditionally defines "STDCHAR" to be
	   the type of char used in stdio.h.  It has the values
	   "unsigned char" or "char".

       ""stdio_base""
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp,
	   to access the _base field (or equivalent) of stdio.h's
	   "FILE" structure.  This will be used to define the
	   macro FILE_base(fp).

       ""stdio_bufsiz""
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp,
	   to determine the number of bytes store in the I/O
	   buffer pointer to by the _base field (or equivalent)
	   of stdio.h's "FILE" structure.  This will be used to
	   define the macro FILE_bufsiz(fp).

       ""stdio_cnt""
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp,
	   to access the _cnt field (or equivalent) of stdio.h's
	   "FILE" structure.  This will be used to define the
	   macro FILE_cnt(fp).

       ""stdio_filbuf""
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp,
	   to tell stdio to refill it's internal buffers (?).
	   This will be used to define the macro FILE_filbuf(fp).

       ""stdio_ptr""
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp,
	   to access the _ptr field (or equivalent) of stdio.h's
	   "FILE" structure.  This will be used to define the
	   macro FILE_ptr(fp).

       ""stdio_stream_array""
	   From stdio_streams.U:

	   This variable tells the name of the array holding the
	   stdio streams.  Usual values include _iob, __iob, and
	   __sF.

       ""strings""
	   From i_string.U:

	   This variable holds the full path of the string header
	   that will be used. Typically /usr/include/string.h or
	   /usr/include/strings.h.

       ""submit""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""subversion""
	   From patchlevel.U:

	   The subversion level of this package.  The value of
	   subversion comes from the patchlevel.h file.	 In a
	   version number such as 5.6.1, this is the "1".  In
	   patchlevel.h, this is referred to as "PERL_SUBVER
	   SION".  This is unique to perl.

       ""sysman""
	   From sysman.U:

	   This variable holds the place where the manual is
	   located on this system. It is not the place where the
	   user wants to put his manual pages. Rather it is the
	   place where Configure may look to find manual for unix
	   commands (section 1 of the manual usually). See man
	   src.

       t

       ""tail""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""tar""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""tbl""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""tee""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""test""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the test pro
	   gram.  After Configure runs, the value is reset to a
	   plain "test" and is not useful.

       ""timeincl""
	   From i_time.U:

	   This variable holds the full path of the included time
	   header(s).

       ""timetype""
	   From d_time.U:

	   This variable holds the type returned by time(). It
	   can be long, or time_t on "BSD" sites (in which case
	   <sys/types.h> should be included). Anyway, the type
	   Time_t should be used.

       ""touch""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the touch pro
	   gram.  After Configure runs, the value is reset to a
	   plain "touch" and is not useful.

       ""tr""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the tr pro
	   gram.  After Configure runs, the value is reset to a
	   plain "tr" and is not useful.

       ""trnl""
	   From trnl.U:

	   This variable contains the value to be passed to the
	   tr(1) command to transliterate a newline.  Typical
	   values are "\012" and "\n".	This is needed for
	   "EBCDIC" systems where newline is not necessarily
	   "\012".

       ""troff""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       u

       ""u16size""
	   From perlxv.U:

	   This variable is the size of an U16 in bytes.

       ""u16type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's U16.

       ""u32size""
	   From perlxv.U:

	   This variable is the size of an U32 in bytes.

       ""u32type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's U32.

       ""u64size""
	   From perlxv.U:

	   This variable is the size of an U64 in bytes.

       ""u64type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's U64.

       ""u8size""
	   From perlxv.U:

	   This variable is the size of an U8 in bytes.

       ""u8type""
	   From perlxv.U:

	   This variable contains the C type used for Perl's U8.

       ""uidformat""
	   From uidf.U:

	   This variable contains the format string used for
	   printing a Uid_t.

       ""uidsign""
	   From uidsign.U:

	   This variable contains the signedness of a uidtype.	1
	   for unsigned, -1 for signed.

       ""uidsize""
	   From uidsize.U:

	   This variable contains the size of a uidtype in bytes.

       ""uidtype""
	   From uidtype.U:

	   This variable defines Uid_t to be something like
	   uid_t, int, ushort, or whatever type is used to
	   declare user ids in the kernel.

       ""uname""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the uname pro
	   gram.  After Configure runs, the value is reset to a
	   plain "uname" and is not useful.

       ""uniq""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the uniq pro
	   gram.  After Configure runs, the value is reset to a
	   plain "uniq" and is not useful.

       ""uquadtype""
	   From quadtype.U:

	   This variable defines Uquad_t to be something like
	   unsigned long, unsigned int, unsigned long long,
	   uint64_t, or whatever type is used for 64-bit inte
	   gers.

       ""use5005threads""
	   From usethreads.U:

	   This variable conditionally defines the
	   USE_5005THREADS symbol, and indicates that Perl should
	   be built to use the 5.005-based threading implementa
	   tion.

       ""use64bitall""
	   From use64bits.U:

	   This variable conditionally defines the USE_64_BIT_ALL
	   symbol, and indicates that 64-bit integer types should
	   be used when available.  The maximal possible 64-bit
	   ness is employed: LP64 or ILP64, meaning that you will
	   be able to use more than 2 gigabytes of memory.  This
	   mode is even more binary incompatible than
	   USE_64_BIT_INT. You may not be able to run the result
	   ing executable in a 32-bit "CPU" at all or you may
	   need at least to reboot your "OS" to 64-bit mode.

       ""use64bitint""
	   From use64bits.U:

	   This variable conditionally defines the USE_64_BIT_INT
	   symbol, and indicates that 64-bit integer types should
	   be used when available.  The minimal possible 64-bit
	   ness is employed, just enough to get 64-bit integers
	   into Perl.  This may mean using for example "long
	   longs", while your memory may still be limited to 2
	   gigabytes.

       ""usedl""
	   From dlsrc.U:

	   This variable indicates if the system supports dynamic
	   loading of some sort.  See also dlsrc and dlobj.

       ""useithreads""
	   From usethreads.U:

	   This variable conditionally defines the "USE_ITHREADS"
	   symbol, and indicates that Perl should be built to use
	   the interpreter-based threading implementation.

       ""uselargefiles""
	   From uselfs.U:

	   This variable conditionally defines the
	   "USE_LARGE_FILES" symbol, and indicates that large
	   file interfaces should be used when available.

       ""uselongdouble""
	   From uselongdbl.U:

	   This variable conditionally defines the "USE_LONG_DOU
	   BLE" symbol, and indicates that long doubles should be
	   used when available.

       ""usemorebits""
	   From usemorebits.U:

	   This variable conditionally defines the
	   "USE_MORE_BITS" symbol, and indicates that explicit
	   64-bit interfaces and long doubles should be used when
	   available.

       ""usemultiplicity""
	   From usemultiplicity.U:

	   This variable conditionally defines the "MULTIPLICITY"
	   symbol, and indicates that Perl should be built to use
	   multiplicity.

       ""usemymalloc""
	   From mallocsrc.U:

	   This variable contains y if the malloc that comes with
	   this package is desired over the system's version of
	   malloc.  People often include special versions of mal
	   loc for effiency, but such versions are often less
	   portable.  See also mallocsrc and mallocobj.	 If this
	   is "y", then -lmalloc is removed from $libs.

       ""usenm""
	   From usenm.U:

	   This variable contains "true" or "false" depending
	   whether the nm extraction is wanted or not.

       ""useopcode""
	   From Extensions.U:

	   This variable holds either "true" or "false" to indi
	   cate whether the Opcode extension should be used.  The
	   sole use for this currently is to allow an easy mecha
	   nism for users to skip the Opcode extension from the
	   Configure command line.

       ""useperlio""
	   From useperlio.U:

	   This variable conditionally defines the "USE_PERLIO"
	   symbol, and indicates that the PerlIO abstraction
	   should be used throughout.

       ""useposix""
	   From Extensions.U:

	   This variable holds either "true" or "false" to indi
	   cate whether the "POSIX" extension should be used.
	   The sole use for this currently is to allow an easy
	   mechanism for hints files to indicate that "POSIX"
	   will not compile on a particular system.

       ""usesfio""
	   From d_sfio.U:

	   This variable is set to true when the user agrees to
	   use sfio.  It is set to false when sfio is not avail
	   able or when the user explicitely requests not to use
	   sfio.  It is here primarily so that command-line set
	   tings can override the auto-detection of d_sfio with
	   out running into a "WHOA THERE".

       ""useshrplib""
	   From libperl.U:

	   This variable is set to "yes" if the user wishes to
	   build a shared libperl, and "no" otherwise.

       ""usesocks""
	   From usesocks.U:

	   This variable conditionally defines the "USE_SOCKS"
	   symbol, and indicates that Perl should be built to use
	   "SOCKS".

       ""usethreads""
	   From usethreads.U:

	   This variable conditionally defines the "USE_THREADS"
	   symbol, and indicates that Perl should be built to use
	   threads.

       ""usevendorprefix""
	   From vendorprefix.U:

	   This variable tells whether the vendorprefix and con
	   sequently other vendor* paths are in use.

       ""usevfork""
	   From d_vfork.U:

	   This variable is set to true when the user accepts to
	   use vfork.  It is set to false when no vfork is avail
	   able or when the user explicitely requests not to use
	   vfork.

       ""usrinc""
	   From usrinc.U:

	   This variable holds the path of the include files,
	   which is usually /usr/include. It is mainly used by
	   other Configure units.

       ""uuname""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""uvoformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "UV" as an unsigned octal integer.

       ""uvsize""
	   From perlxv.U:

	   This variable is the size of a "UV" in bytes.

       ""uvtype""
	   From perlxv.U:

	   This variable contains the C type used for Perl's
	   "UV".

       ""uvuformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "UV" as an unsigned decimal integer.

       ""uvxformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "UV" as an unsigned hexadecimal inte
	   ger in lowercase abcdef.

       ""uvXUformat""
	   From perlxvf.U:

	   This variable contains the format string used for
	   printing a Perl "UV" as an unsigned hexadecimal inte
	   ger in uppercase "ABCDEF".

       v

       ""vendorarch""
	   From vendorarch.U:

	   This variable contains the value of the "PERL_VENDO
	   RARCH" symbol.  It may have a ~ on the front.  The
	   standard distribution will put nothing in this direc
	   tory.  Vendors who distribute perl may wish to place
	   their own architecture-dependent modules and exten
	   sions in this directory with MakeMaker Makefile.PL
	   "INSTALLDIRS"=vendor or equivalent.	See "INSTALL" for
	   details.

       ""vendorarchexp""
	   From vendorarch.U:

	   This variable is the ~name expanded version of vendo
	   rarch, so that you may use it directly in Makefiles or
	   shell scripts.

       ""vendorbin""
	   From vendorbin.U:

	   This variable contains the eventual value of the "VEN
	   DORBIN" symbol.  It may have a ~ on the front.  The
	   standard distribution will put nothing in this direc
	   tory.  Vendors who distribute perl may wish to place
	   additional binaries in this directory with MakeMaker
	   Makefile.PL "INSTALLDIRS"=vendor or equivalent.  See
	   "INSTALL" for details.

       ""vendorbinexp""
	   From vendorbin.U:

	   This variable is the ~name expanded version of ven
	   dorbin, so that you may use it directly in Makefiles
	   or shell scripts.

       ""vendorlib""
	   From vendorlib.U:

	   This variable contains the eventual value of the "VEN
	   DORLIB" symbol, which is the name of the private
	   library for this package.  The standard distribution
	   will put nothing in this directory.	Vendors who dis
	   tribute perl may wish to place their own modules in
	   this directory with MakeMaker Makefile.PL
	   "INSTALLDIRS"=vendor or equivalent.	See "INSTALL" for
	   details.

       ""vendorlib_stem""
	   From vendorlib.U:

	   This variable is $vendorlibexp with any trailing ver
	   sion-specific component removed.  The elements in
	   inc_version_list (inc_version_list.U) can be tacked
	   onto this variable to generate a list of directories
	   to search.

       ""vendorlibexp""
	   From vendorlib.U:

	   This variable is the ~name expanded version of vendor
	   lib, so that you may use it directly in Makefiles or
	   shell scripts.

       ""vendorprefix""
	   From vendorprefix.U:

	   This variable holds the full absolute path of the
	   directory below which the vendor will install add-on
	   packages.  See "INSTALL" for usage and examples.

       ""vendorprefixexp""
	   From vendorprefix.U:

	   This variable holds the full absolute path of the
	   directory below which the vendor will install add-on
	   packages.  Derived from vendorprefix.

       ""version""
	   From patchlevel.U:

	   The full version number of this package, such as 5.6.1
	   (or 5_6_1).	This combines revision, patchlevel, and
	   subversion to get the full version number, including
	   any possible subversions.  This is suitable for use as
	   a directory name, and hence is filesystem dependent.

       ""versiononly""
	   From versiononly.U:

	   If set, this symbol indicates that only the version-
	   specific components of a perl installation should be
	   installed.  This may be useful for making a test
	   installation of a new version without disturbing the
	   existing installation.  Setting versiononly is equiva
	   lent to setting installperl's -v option.  In particu
	   lar, the non-versioned scripts and programs such as
	   a2p, c2ph, h2xs, pod2*, and perldoc are not installed
	   (see "INSTALL" for a more complete list).  Nor are the
	   man pages installed.	 Usually, this is undef.

       ""vi""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""voidflags""
	   From voidflags.U:

	   This variable contains the eventual value of the
	   "VOIDFLAGS" symbol, which indicates how much support
	   of the void type is given by this compiler.	See
	   "VOIDFLAGS" for more info.

       x

       ""xlibpth""
	   From libpth.U:

	   This variable holds extra path (space-separated) used
	   to find libraries on this platform, for example
	   "CPU"-specific libraries (on multi-"CPU" platforms)
	   may be listed here.

       ""xs_apiversion""
	   From xs_apiversion.U:

	   This variable contains the version of the oldest perl
	   binary compatible with the present perl.  perl.c:inc_
	   push() and lib/lib.pm will automatically search in
	   $sitearch for older directories across major versions
	   back to xs_apiversion.  This is only useful if you
	   have a perl library directory tree structured like the
	   default one.	 See "INSTALL" for how this works.  The
	   versioned site_perl directory was introduced in 5.005,
	   so that is the lowest possible value.  Since this can
	   depend on compile time options (such as bincompat) it
	   is set by Configure.	 Other non-default sources of
	   potential incompatibility, such as multiplicity,
	   threads, debugging, 64bits, sfio, etc., are not
	   checked for currently, though in principle we could go
	   snooping around in old Config.pm files.

       z

       ""zcat""
	   From Loc.U:

	   This variable is defined but not used by Configure.
	   The value is a plain '' and is not useful.

       ""zip""
	   From Loc.U:

	   This variable is used internally by Configure to
	   determine the full pathname (if any) of the zip pro
	   gram.  After Configure runs, the value is reset to a
	   plain "zip" and is not useful.

NOTE
       This module contains a good example of how to use tie to
       implement a cache and an example of how to make a tied
       variable readonly to those outside of it.

2001-03-18		   perl v5.6.1			Config(3)
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