/sys$common/syshlp/helplib.hlb LOCALE, COMPILE, Qualifiers, /CHARACTER_DEFINITIONS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

     /[NO]CHARACTER_DEFINITIONS[=filename]
     /NOCHARACTER_DEFINITIONS (D)

   Specifies a character-set description file (charmap) for the
   locale.  This file maps characters to their actual character
   encodings.  If a charmap is not specified, no symbolic names
   (other than collating symbols defined in a collating symbol
   keyword) are allowed in the locale source file.  The default file
   type for a charmap is .CMAP.