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PERLWIN32(1perl)       Perl Programmers Reference Guide	      PERLWIN32(1perl)

       perlwin32 - Perl under Windows

       These are instructions for building Perl under Windows 2000 and later.

       Before you start, you should glance through the README file found in
       the top-level directory to which the Perl distribution was extracted.
       Make sure you read and understand the terms under which this software
       is being distributed.

       Also make sure you read "BUGS AND CAVEATS" below for the known
       limitations of this port.

       The INSTALL file in the perl top-level has much information that is
       only relevant to people building Perl on Unix-like systems.  In
       particular, you can safely ignore any information that talks about

       You may also want to look at one other option for building a perl that
       will work on Windows: the README.cygwin file, which give a different
       set of rules to build a perl for Windows.  This method will probably
       enable you to build a more Unix-compatible perl, but you will also need
       to download and use various other build-time and run-time support
       software described in that file.

       This set of instructions is meant to describe a so-called "native" port
       of Perl to the Windows platform.	 This includes both 32-bit and 64-bit
       Windows operating systems.  The resulting Perl requires no additional
       software to run (other than what came with your operating system).
       Currently, this port is capable of using one of the following compilers
       on the Intel x86 architecture:

	     Microsoft Visual C++    version 6.0 or later
	     Gcc by	     gcc version 3.2 or later
	     Gcc by gcc version 4.4.3 or later

       Note that the last two of these are actually competing projects both
       delivering complete gcc toolchain for MS Windows:

	   Delivers gcc toolchain targeting 32-bit Windows platform.

	   Delivers gcc toolchain targeting both 64-bit Windows and 32-bit
	   Windows platforms (despite the project name "mingw-w64" they are
	   not only 64-bit oriented). They deliver the native gcc compilers
	   and cross-compilers that are also supported by perl's makefile.

       The Microsoft Visual C++ compilers are also now being given away free.
       They are available as "Visual C++ Toolkit 2003" or "Visual C++
       2005/2008/2010/2012 Express Edition" (and also as part of the ".NET
       Framework SDK") and are the same compilers that ship with "Visual C++
       .NET 2003 Professional" or "Visual C++ 2005/2008/2010/2012
       Professional" respectively.

       This port can also be built on IA64/AMD64 using:

	     Microsoft Platform SDK    Nov 2001 (64-bit compiler and tools)
	     MinGW64 compiler (gcc version 4.4.3 or later)

       The Windows SDK can be downloaded from <>.
       The MinGW64 compiler is available at
       <>.  The latter is actually a
       cross-compiler targeting Win64. There's also a trimmed down compiler
       (no java, or gfortran) suitable for building perl available at:

       NOTE: If you're using a 32-bit compiler to build perl on a 64-bit
       Windows operating system, then you should set the WIN64 environment
       variable to "undef".  Also, the trimmed down compiler only passes tests
       when USE_ITHREADS *= define (as opposed to undef) and when the CFG *=
       Debug line is commented out.

       This port fully supports MakeMaker (the set of modules that is used to
       build extensions to perl).  Therefore, you should be able to build and
       install most extensions found in the CPAN sites.	 See "Usage Hints for
       Perl on Windows" below for general hints about this.

   Setting Up Perl on Windows
	   You need a "make" program to build the sources.  If you are using
	   Visual C++ or the Windows SDK tools, nmake will work.  Builds using
	   the gcc need dmake.

	   dmake is a freely available make that has very nice macro features
	   and parallelability.

	   A port of dmake for Windows is available from:


	   Fetch and install dmake somewhere on your path.

       Command Shell
	   Use the default "cmd" shell that comes with Windows.	 Some versions
	   of the popular 4DOS/NT shell have incompatibilities that may cause
	   you trouble.	 If the build fails under that shell, try building
	   again with the cmd shell.

	   Make sure the path to the build directory does not contain spaces.
	   The build usually works in this circumstance, but some tests will

       Microsoft Visual C++
	   The nmake that comes with Visual C++ will suffice for building.
	   You will need to run the VCVARS32.BAT file, usually found somewhere
	   like C:\Program Files\Microsoft Visual Studio\VC98\Bin.  This will
	   set your build environment.

	   You can also use dmake to build using Visual C++; provided,
	   however, you set OSRELEASE to "microsft" (or whatever the directory
	   name under which the Visual C dmake configuration lives) in your
	   environment and edit win32/ to change "make=nmake" into
	   "make=dmake".  The latter step is only essential if you want to use
	   dmake as your default make for building extensions using MakeMaker.

       Microsoft Visual C++ 2008/2010/2012 Express Edition
	   These free versions of Visual C++ 2008/2010/2012 Professional
	   contain the same compilers and linkers that ship with the full
	   versions, and also contain everything necessary to build Perl,
	   rather than requiring a separate download of the Windows SDK like
	   previous versions did.

	   These packages can be downloaded by searching in the Download
	   Center at
	   (Providing exact links to these packages has proven a pointless
	   task because the links keep on changing so often.)

	   Install Visual C++ 2008/2010/2012 Express, then setup your
	   environment using, e.g.

		   C:\Program Files\Microsoft Visual Studio 11.0\Common7\Tools\vsvars32.bat

	   (assuming the default installation location was chosen).

	   Perl should now build using the win32/Makefile.  You will need to
	   edit that file to set CCTYPE to MSVC90FREE or MSVC100FREE first.

       Microsoft Visual C++ 2005 Express Edition
	   This free version of Visual C++ 2005 Professional contains the same
	   compiler and linker that ship with the full version, but doesn't
	   contain everything necessary to build Perl.

	   You will also need to download the "Windows SDK" (the "Core SDK"
	   and "MDAC SDK" components are required) for more header files and

	   These packages can both be downloaded by searching in the Download
	   Center at
	   (Providing exact links to these packages has proven a pointless
	   task because the links keep on changing so often.)

	   Try to obtain the latest version of the Windows SDK.	 Sometimes
	   these packages contain a particular Windows OS version in their
	   name, but actually work on other OS versions too.  For example, the
	   "Windows Server 2003 R2 Platform SDK" also runs on Windows XP SP2
	   and Windows 2000.

	   Install Visual C++ 2005 first, then the Platform SDK.  Setup your
	   environment as follows (assuming default installation locations
	   were chosen):

		   SET PlatformSDKDir=C:\Program Files\Microsoft Platform SDK

		   SET PATH=%SystemRoot%\system32;%SystemRoot%;C:\Program Files\Microsoft Visual Studio 8\Common7\IDE;C:\Program Files\Microsoft Visual Studio 8\VC\BIN;C:\Program Files\Microsoft Visual Studio 8\Common7\Tools;C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\bin;C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\Program Files\Microsoft Visual Studio 8\VC\VCPackages;%PlatformSDKDir%\Bin

		   SET INCLUDE=C:\Program Files\Microsoft Visual Studio 8\VC\INCLUDE;%PlatformSDKDir%\include

		   SET LIB=C:\Program Files\Microsoft Visual Studio 8\VC\LIB;C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\lib;%PlatformSDKDir%\lib

		   SET LIBPATH=C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727

	   (The PlatformSDKDir might need to be set differently depending on
	   which version you are using. Earlier versions installed into
	   "C:\Program Files\Microsoft SDK", while the latest versions install
	   into version-specific locations such as "C:\Program Files\Microsoft
	   Platform SDK for Windows Server 2003 R2".)

	   Perl should now build using the win32/Makefile.  You will need to
	   edit that file to set


	   and to set CCHOME, CCINCDIR and CCLIBDIR as per the environment
	   setup above.

       Microsoft Visual C++ Toolkit 2003
	   This free toolkit contains the same compiler and linker that ship
	   with Visual C++ .NET 2003 Professional, but doesn't contain
	   everything necessary to build Perl.

	   You will also need to download the "Platform SDK" (the "Core SDK"
	   and "MDAC SDK" components are required) for header files, libraries
	   and rc.exe, and ".NET Framework SDK" for more libraries and
	   nmake.exe.  Note that the latter (which also includes the free
	   compiler and linker) requires the ".NET Framework Redistributable"
	   to be installed first.  This can be downloaded and installed
	   separately, but is included in the "Visual C++ Toolkit 2003"

	   These packages can all be downloaded by searching in the Download
	   Center at
	   (Providing exact links to these packages has proven a pointless
	   task because the links keep on changing so often.)

	   Try to obtain the latest version of the Windows SDK.	 Sometimes
	   these packages contain a particular Windows OS version in their
	   name, but actually work on other OS versions too.  For example, the
	   "Windows Server 2003 R2 Platform SDK" also runs on Windows XP SP2
	   and Windows 2000.

	   Install the Toolkit first, then the Platform SDK, then the .NET
	   Framework SDK.  Setup your environment as follows (assuming default
	   installation locations were chosen):

		   SET PlatformSDKDir=C:\Program Files\Microsoft Platform SDK

		   SET PATH=%SystemRoot%\system32;%SystemRoot%;C:\Program Files\Microsoft Visual C++ Toolkit 2003\bin;%PlatformSDKDir%\Bin;C:\Program Files\Microsoft.NET\SDK\v1.1\Bin

		   SET INCLUDE=C:\Program Files\Microsoft Visual C++ Toolkit 2003\include;%PlatformSDKDir%\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include

		   SET LIB=C:\Program Files\Microsoft Visual C++ Toolkit 2003\lib;%PlatformSDKDir%\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\lib

	   (The PlatformSDKDir might need to be set differently depending on
	   which version you are using. Earlier versions installed into
	   "C:\Program Files\Microsoft SDK", while the latest versions install
	   into version-specific locations such as "C:\Program Files\Microsoft
	   Platform SDK for Windows Server 2003 R2".)

	   Several required files will still be missing:

	   ·   cvtres.exe is required by link.exe when using a .res file.  It
	       is actually installed by the .NET Framework SDK, but into a
	       location such as the following:


	       Copy it from there to %PlatformSDKDir%\Bin

	   ·   lib.exe is normally used to build libraries, but link.exe with
	       the /lib option also works, so change win32/ to use it

	       Change the line reading:



		       ar='link /lib'

	       It may also be useful to create a batch file called lib.bat in
	       C:\Program Files\Microsoft Visual C++ Toolkit 2003\bin

		       @echo off
		       link /lib %*

	       for the benefit of any naughty C extension modules that you
	       might want to build later which explicitly reference "lib"
	       rather than taking their value from $Config{ar}.

	   ·   setargv.obj is required to build perlglob.exe (and perl.exe if
	       the USE_SETARGV option is enabled).  The Platform SDK supplies
	       this object file in source form in %PlatformSDKDir%\src\crt.
	       Copy setargv.c, cruntime.h and internal.h from there to some
	       temporary location and build setargv.obj using

		       cl.exe /c /I. /D_CRTBLD setargv.c

	       Then copy setargv.obj to %PlatformSDKDir%\lib

	       Alternatively, if you don't need perlglob.exe and don't need to
	       enable the USE_SETARGV option then you can safely just remove
	       all mention of $(GLOBEXE) from win32/Makefile and setargv.obj
	       won't be required anyway.

	   Perl should now build using the win32/Makefile.  You will need to
	   edit that file to set


	   and to set CCHOME, CCINCDIR and CCLIBDIR as per the environment
	   setup above.

       Microsoft Platform SDK 64-bit Compiler
	   The nmake that comes with the Platform SDK will suffice for
	   building Perl.  Make sure you are building within one of the "Build
	   Environment" shells available after you install the Platform SDK
	   from the Start Menu.

       MinGW release 3 with gcc
	   Perl can be compiled with gcc from MinGW release 3 and later (using
	   gcc 3.2.x and later).  It can be downloaded here:


	   You also need dmake.	 See "Make" above on how to get it.

       ·   Make sure you are in the "win32" subdirectory under the perl
	   toplevel.  This directory contains a "Makefile" that will work with
	   versions of nmake that come with Visual C++ or the Windows SDK, and
	   a dmake "" that will work for all supported compilers.
	   The defaults in the dmake makefile are setup to build using

       ·   Edit the (or Makefile, if you're using nmake) and
	   change the values of INST_DRV and INST_TOP.	 You can also enable
	   various build flags.	 These are explained in the makefiles.

	   Note that it is generally not a good idea to try to build a perl
	   with INST_DRV and INST_TOP set to a path that already exists from a
	   previous build.  In particular, this may cause problems with the
	   lib/ExtUtils/t/Embed.t test, which attempts to build a test program
	   and may end up building against the installed perl's lib/CORE
	   directory rather than the one being tested.

	   You will have to make sure that CCTYPE is set correctly and that
	   CCHOME points to wherever you installed your compiler.

	   If building with the cross-compiler provided by you'll need to uncomment the line that
	   sets GCCCROSS in the Do this only if it's the cross-
	   compiler - ie only if the bin folder doesn't contain a gcc.exe.
	   (The cross-compiler does not provide a gcc.exe, g++.exe, ar.exe,
	   etc. Instead, all of these executables are prefixed with

	   The default value for CCHOME in the makefiles for Visual C++ may
	   not be correct for some versions.  Make sure the default exists and
	   is valid.

	   You may also need to comment out the "DELAYLOAD = ..." line in the
	   Makefile if you're using VC++ 6.0 without the latest service pack
	   and the linker reports an internal error.

	   If you want build some core extensions statically into perl's dll,
	   specify them in the STATIC_EXT macro.

	   Be sure to read the instructions near the top of the makefiles

       ·   Type "dmake" (or "nmake" if you are using that make).

	   This should build everything.  Specifically, it will create
	   perl.exe, perl518.dll at the perl toplevel, and various other
	   extension dll's under the lib\auto directory.  If the build fails
	   for any reason, make sure you have done the previous steps

   Testing Perl on Windows
       Type "dmake test" (or "nmake test").  This will run most of the tests
       from the testsuite (many tests will be skipped).

       There should be no test failures.

       Some test failures may occur if you use a command shell other than the
       native "cmd.exe", or if you are building from a path that contains
       spaces.	So don't do that.

       If you are running the tests from a emacs shell window, you may see
       failures in op/stat.t.  Run "dmake test-notty" in that case.

       If you run the tests on a FAT partition, you may see some failures for
       "link()" related tests (op/write.t, op/stat.t ...). Testing on NTFS
       avoids these errors.

       Furthermore, you should make sure that during "make test" you do not
       have any GNU tool packages in your path: some toolkits like Unixutils
       include some tools ("type" for instance) which override the Windows
       ones and makes tests fail. Remove them from your path while testing to
       avoid these errors.

       Please report any other failures as described under "BUGS AND CAVEATS".

   Installation of Perl on Windows
       Type "dmake install" (or "nmake install").  This will put the newly
       built perl and the libraries under whatever "INST_TOP" points to in the
       Makefile.  It will also install the pod documentation under
       "$INST_TOP\$INST_VER\lib\pod" and HTML versions of the same under

       To use the Perl you just installed you will need to add a new entry to
       your PATH environment variable: "$INST_TOP\bin", e.g.

	   set PATH=c:\perl\bin;%PATH%

       If you opted to uncomment "INST_VER" and "INST_ARCH" in the makefile
       then the installation structure is a little more complicated and you
       will need to add two new PATH components instead:
       "$INST_TOP\$INST_VER\bin" and "$INST_TOP\$INST_VER\bin\$ARCHNAME", e.g.

	   set PATH=c:\perl\5.6.0\bin;c:\perl\5.6.0\bin\MSWin32-x86;%PATH%

   Usage Hints for Perl on Windows
       Environment Variables
	   The installation paths that you set during the build get compiled
	   into perl, so you don't have to do anything additional to start
	   using that perl (except add its location to your PATH variable).

	   If you put extensions in unusual places, you can set PERL5LIB to a
	   list of paths separated by semicolons where you want perl to look
	   for libraries.  Look for descriptions of other environment
	   variables you can set in perlrun.

	   You can also control the shell that perl uses to run system() and
	   backtick commands via PERL5SHELL.  See perlrun.

	   Perl does not depend on the registry, but it can look up certain
	   default values if you choose to put them there.  Perl attempts to
	   read entries from "HKEY_CURRENT_USER\Software\Perl" and
	   "HKEY_LOCAL_MACHINE\Software\Perl".	Entries in the former override
	   entries in the latter.  One or more of the following entries (of
	   type REG_SZ or REG_EXPAND_SZ) may be set:

	       lib-$]		   version-specific standard library path to add to @INC
	       lib		   standard library path to add to @INC
	       sitelib-$]	   version-specific site library path to add to @INC
	       sitelib		   site library path to add to @INC
	       vendorlib-$]	   version-specific vendor library path to add to @INC
	       vendorlib	   vendor library path to add to @INC
	       PERL*		   fallback for all %ENV lookups that begin with "PERL"

	   Note the $] in the above is not literal.  Substitute whatever
	   version of perl you want to honor that entry, e.g. 5.6.0.  Paths
	   must be separated with semicolons, as usual on Windows.

       File Globbing
	   By default, perl handles file globbing using the File::Glob
	   extension, which provides portable globbing.

	   If you want perl to use globbing that emulates the quirks of DOS
	   filename conventions, you might want to consider using
	   File::DosGlob to override the internal glob() implementation.  See
	   File::DosGlob for details.

       Using perl from the command line
	   If you are accustomed to using perl from various command-line
	   shells found in UNIX environments, you will be less than pleased
	   with what Windows offers by way of a command shell.

	   The crucial thing to understand about the Windows environment is
	   that the command line you type in is processed twice before Perl
	   sees it.  First, your command shell (usually CMD.EXE) preprocesses
	   the command line, to handle redirection, environment variable
	   expansion, and location of the executable to run. Then, the perl
	   executable splits the remaining command line into individual
	   arguments, using the C runtime library upon which Perl was built.

	   It is particularly important to note that neither the shell nor the
	   C runtime do any wildcard expansions of command-line arguments (so
	   wildcards need not be quoted).  Also, the quoting behaviours of the
	   shell and the C runtime are rudimentary at best (and may, if you
	   are using a non-standard shell, be inconsistent).  The only
	   (useful) quote character is the double quote (").  It can be used
	   to protect spaces and other special characters in arguments.

	   The Windows documentation describes the shell parsing rules here:
	   and the C runtime parsing rules here:

	   Here are some further observations based on experiments: The C
	   runtime breaks arguments at spaces and passes them to programs in
	   argc/argv.  Double quotes can be used to prevent arguments with
	   spaces in them from being split up.	You can put a double quote in
	   an argument by escaping it with a backslash and enclosing the whole
	   argument within double quotes.  The backslash and the pair of
	   double quotes surrounding the argument will be stripped by the C

	   The file redirection characters "<", ">", and "|" can be quoted by
	   double quotes (although there are suggestions that this may not
	   always be true).  Single quotes are not treated as quotes by the
	   shell or the C runtime, they don't get stripped by the shell (just
	   to make this type of quoting completely useless).  The caret "^"
	   has also been observed to behave as a quoting character, but this
	   appears to be a shell feature, and the caret is not stripped from
	   the command line, so Perl still sees it (and the C runtime phase
	   does not treat the caret as a quote character).

	   Here are some examples of usage of the "cmd" shell:

	   This prints two doublequotes:

	       perl -e "print '\"\"' "

	   This does the same:

	       perl -e "print \"\\\"\\\"\" "

	   This prints "bar" and writes "foo" to the file "blurch":

	       perl -e "print 'foo'; print STDERR 'bar'" > blurch

	   This prints "foo" ("bar" disappears into nowhereland):

	       perl -e "print 'foo'; print STDERR 'bar'" 2> nul

	   This prints "bar" and writes "foo" into the file "blurch":

	       perl -e "print 'foo'; print STDERR 'bar'" 1> blurch

	   This pipes "foo" to the "less" pager and prints "bar" on the

	       perl -e "print 'foo'; print STDERR 'bar'" | less

	   This pipes "foo\nbar\n" to the less pager:

	       perl -le "print 'foo'; print STDERR 'bar'" 2>&1 | less

	   This pipes "foo" to the pager and writes "bar" in the file

	       perl -e "print 'foo'; print STDERR 'bar'" 2> blurch | less

	   Discovering the usefulness of the "" shell on Windows 9x
	   is left as an exercise to the reader :)

	   One particularly pernicious problem with the 4NT command shell for
	   Windows is that it (nearly) always treats a % character as
	   indicating that environment variable expansion is needed.  Under
	   this shell, it is therefore important to always double any %
	   characters which you want Perl to see (for example, for hash
	   variables), even when they are quoted.

       Building Extensions
	   The Comprehensive Perl Archive Network (CPAN) offers a wealth of
	   extensions, some of which require a C compiler to build.  Look in
	   <> for more information on CPAN.

	   Note that not all of the extensions available from CPAN may work in
	   the Windows environment; you should check the information at
	   <> before investing too much effort into
	   porting modules that don't readily build.

	   Most extensions (whether they require a C compiler or not) can be
	   built, tested and installed with the standard mantra:

	       perl Makefile.PL
	       $MAKE test
	       $MAKE install

	   where $MAKE is whatever 'make' program you have configured perl to
	   use.	 Use "perl -V:make" to find out what this is.  Some extensions
	   may not provide a testsuite (so "$MAKE test" may not do anything or
	   fail), but most serious ones do.

	   It is important that you use a supported 'make' program, and ensure knows about it.  If you don't have nmake, you can either
	   get dmake from the location mentioned earlier or get an old version
	   of nmake reportedly available from:


	   Another option is to use the make written in Perl, available from


	   You may also use dmake.  See "Make" above on how to get it.

	   Note that MakeMaker actually emits makefiles with different syntax
	   depending on what 'make' it thinks you are using.  Therefore, it is
	   important that one of the following values appears in

	       make='nmake'	   # MakeMaker emits nmake syntax
	       make='dmake'	   # MakeMaker emits dmake syntax
	       any other value	   # MakeMaker emits generic make syntax
				       (e.g GNU make, or Perl make)

	   If the value doesn't match the 'make' program you want to use, edit to fix it.

	   If a module implements XSUBs, you will need one of the supported C
	   compilers.  You must make sure you have set up the environment for
	   the compiler for command-line compilation.

	   If a module does not build for some reason, look carefully for why
	   it failed, and report problems to the module author.	 If it looks
	   like the extension building support is at fault, report that with
	   full details of how the build failed using the perlbug utility.

       Command-line Wildcard Expansion
	   The default command shells on DOS descendant operating systems
	   (such as they are) usually do not expand wildcard arguments
	   supplied to programs.  They consider it the application's job to
	   handle that.	 This is commonly achieved by linking the application
	   (in our case, perl) with startup code that the C runtime libraries
	   usually provide.  However, doing that results in incompatible perl
	   versions (since the behavior of the argv expansion code differs
	   depending on the compiler, and it is even buggy on some compilers).
	   Besides, it may be a source of frustration if you use such a perl
	   binary with an alternate shell that *does* expand wildcards.

	   Instead, the following solution works rather well. The nice things
	   about it are 1) you can start using it right away; 2) it is more
	   powerful, because it will do the right thing with a pattern like
	   */*/*.c; 3) you can decide whether you do/don't want to use it; and
	   4) you can extend the method to add any customizations (or even
	   entirely different kinds of wildcard expansion).

		   C:\> copy con c:\perl\lib\
		   # - emulate shell @ARGV expansion on shells that don't
		   use File::DosGlob;
		   @ARGV = map {
				 my @g = File::DosGlob::glob($_) if /[*?]/;
				 @g ? @g : $_;
			       } @ARGV;
		   C:\> set PERL5OPT=-MWild
		   C:\> perl -le "for (@ARGV) { print }" */*/perl*.c

	   Note there are two distinct steps there: 1) You'll have to create and put it in your perl lib directory. 2) You'll need to
	   set the PERL5OPT environment variable.  If you want argv expansion
	   to be the default, just set PERL5OPT in your default startup

	   If you are using the Visual C compiler, you can get the C runtime's
	   command line wildcard expansion built into perl binary.  The
	   resulting binary will always expand unquoted command lines, which
	   may not be what you want if you use a shell that does that for you.
	   The expansion done is also somewhat less powerful than the approach
	   suggested above.

       Notes on 64-bit Windows
	   Windows .NET Server supports the LLP64 data model on the Intel
	   Itanium architecture.

	   The LLP64 data model is different from the LP64 data model that is
	   the norm on 64-bit Unix platforms.  In the former, "int" and "long"
	   are both 32-bit data types, while pointers are 64 bits wide.	 In
	   addition, there is a separate 64-bit wide integral type, "__int64".
	   In contrast, the LP64 data model that is pervasive on Unix
	   platforms provides "int" as the 32-bit type, while both the "long"
	   type and pointers are of 64-bit precision.  Note that both models
	   provide for 64-bits of addressability.

	   64-bit Windows running on Itanium is capable of running 32-bit x86
	   binaries transparently.  This means that you could use a 32-bit
	   build of Perl on a 64-bit system.  Given this, why would one want
	   to build a 64-bit build of Perl?  Here are some reasons why you
	   would bother:

	   ·   A 64-bit native application will run much more efficiently on
	       Itanium hardware.

	   ·   There is no 2GB limit on process size.

	   ·   Perl automatically provides large file support when built under
	       64-bit Windows.

	   ·   Embedding Perl inside a 64-bit application.

   Running Perl Scripts
       Perl scripts on UNIX use the "#!" (a.k.a "shebang") line to indicate to
       the OS that it should execute the file using perl.  Windows has no
       comparable means to indicate arbitrary files are executables.

       Instead, all available methods to execute plain text files on Windows
       rely on the file "extension".  There are three methods to use this to
       execute perl scripts:

       1.      There is a facility called "file extension associations".  This
	       can be manipulated via the two commands "assoc" and "ftype"
	       that come standard with Windows.	 Type "ftype /?" for a
	       complete example of how to set this up for perl scripts (Say
	       what?  You thought Windows wasn't perl-ready? :).

       2.      Since file associations don't work everywhere, and there are
	       reportedly bugs with file associations where it does work, the
	       old method of wrapping the perl script to make it look like a
	       regular batch file to the OS, may be used.  The install process
	       makes available the "pl2bat.bat" script which can be used to
	       wrap perl scripts into batch files.  For example:


	       will create the file "FOO.BAT".	Note "pl2bat" strips any .pl
	       suffix and adds a .bat suffix to the generated file.

	       If you use the 4DOS/NT or similar command shell, note that
	       "pl2bat" uses the "%*" variable in the generated batch file to
	       refer to all the command line arguments, so you may need to
	       make sure that construct works in batch files.  As of this
	       writing, 4DOS/NT users will need a "ParameterChar = *"
	       statement in their 4NT.INI file or will need to execute "setdos
	       /p*" in the 4DOS/NT startup file to enable this to work.

       3.      Using "pl2bat" has a few problems:  the file name gets changed,
	       so scripts that rely on $0 to find what they must do may not
	       run properly; running "pl2bat" replicates the contents of the
	       original script, and so this process can be maintenance
	       intensive if the originals get updated often.  A different
	       approach that avoids both problems is possible.

	       A script called "runperl.bat" is available that can be copied
	       to any filename (along with the .bat suffix).  For example, if
	       you call it "foo.bat", it will run the file "foo" when it is
	       executed.  Since you can run batch files on Windows platforms
	       simply by typing the name (without the extension), this
	       effectively runs the file "foo", when you type either "foo" or
	       "foo.bat".  With this method, "foo.bat" can even be in a
	       different location than the file "foo", as long as "foo" is
	       available somewhere on the PATH.	 If your scripts are on a
	       filesystem that allows symbolic links, you can even avoid
	       copying "runperl.bat".

	       Here's a diversion:  copy "runperl.bat" to "runperl", and type
	       "runperl".  Explain the observed behavior, or lack thereof. :)
	       Hint: .gnidnats llits er'uoy fi ,"lrepnur" eteled :tniH

   Miscellaneous Things
       A full set of HTML documentation is installed, so you should be able to
       use it if you have a web browser installed on your system.

       "perldoc" is also a useful tool for browsing information contained in
       the documentation, especially in conjunction with a pager like "less"
       (recent versions of which have Windows support).	 You may have to set
       the PAGER environment variable to use a specific pager.	"perldoc -f
       foo" will print information about the perl operator "foo".

       One common mistake when using this port with a GUI library like "Tk" is
       assuming that Perl's normal behavior of opening a command-line window
       will go away.  This isn't the case.  If you want to start a copy of
       "perl" without opening a command-line window, use the "wperl"
       executable built during the installation process.  Usage is exactly the
       same as normal "perl" on Windows, except that options like "-h" don't
       work (since they need a command-line window to print to).

       If you find bugs in perl, you can run "perlbug" to create a bug report
       (you may have to send it manually if "perlbug" cannot find a mailer on
       your system).

       Norton AntiVirus interferes with the build process, particularly if set
       to "AutoProtect, All Files, when Opened". Unlike large applications the
       perl build process opens and modifies a lot of files. Having the the
       AntiVirus scan each and every one slows build the process
       significantly.  Worse, with PERLIO=stdio the build process fails with
       peculiar messages as the virus checker interacts badly with
       miniperl.exe writing configure files (it seems to either catch file
       part written and treat it as suspicious, or virus checker may have it
       "locked" in a way which inhibits miniperl updating it). The build does
       complete with

	  set PERLIO=perlio

       but that may be just luck. Other AntiVirus software may have similar

       Some of the built-in functions do not act exactly as documented in
       perlfunc, and a few are not implemented at all.	To avoid surprises,
       particularly if you have had prior exposure to Perl in other operating
       environments or if you intend to write code that will be portable to
       other environments, see perlport for a reasonably definitive list of
       these differences.

       Not all extensions available from CPAN may build or work properly in
       the Windows environment.	 See "Building Extensions".

       Most "socket()" related calls are supported, but they may not behave as
       on Unix platforms.  See perlport for the full list.

       Signal handling may not behave as on Unix platforms (where it doesn't
       exactly "behave", either :).  For instance, calling "die()" or "exit()"
       from signal handlers will cause an exception, since most
       implementations of "signal()" on Windows are severely crippled.	Thus,
       signals may work only for simple things like setting a flag variable in
       the handler.  Using signals under this port should currently be
       considered unsupported.

       Please send detailed descriptions of any problems and solutions that
       you may find to <>, along with the output produced by
       "perl -V".

       The use of a camel with the topic of Perl is a trademark of O'Reilly
       and Associates, Inc. Used with permission.

       Gary Ng <71564.1743@CompuServe.COM>
       Gurusamy Sarathy <>
       Nick Ing-Simmons <>
       Jan Dubois <>
       Steve Hay <>

       This document is maintained by Jan Dubois.


       This port was originally contributed by Gary Ng around 5.003_24, and
       borrowed from the Hip Communications port that was available at the
       time.  Various people have made numerous and sundry hacks since then.

       GCC/mingw32 support was added in 5.005 (Nick Ing-Simmons).

       Support for PERL_OBJECT was added in 5.005 (ActiveState Tool Corp).

       Support for fork() emulation was added in 5.6 (ActiveState Tool Corp).

       Win9x support was added in 5.6 (Benjamin Stuhl).

       Support for 64-bit Windows added in 5.8 (ActiveState Corp).

       Last updated: 02 January 2012

perl v5.18.2			  2014-01-06		      PERLWIN32(1perl)

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