VMS Help FORTRAN, Statements, Directive Statements, ALIAS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  CDEC$ ALIAS name, external-name

  The ALIAS directive lets you specify an alternate external name to
  be used when referring to external objects such as subroutines and
  functions.  This can be useful when compiling applications written
  for other platforms which have different naming conventions.

  The external-name may be an identifier or a quoted character constant.
  If a quoted character constant is specified, it is used as-is; the
  string is not changed to upper case nor are blanks removed.  Names
  which are not acceptable to the OpenVMS linker will cause link-time
  errors.

  The ALIAS directive affects only the external name used for references
  to the specified internal name.