# serial 9

dnl From Jim Meyering.

dnl Find a new-enough version of Perl.

# Copyright (C) 1998-2001, 2003-2004, 2007, 2009-2017 Free Software Foundation,

# Inc.

#

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_PERL],

[

  dnl FIXME: don't hard-code 5.005

  AC_MSG_CHECKING([for perl5.005 or newer])

  if test "${PERL+set}" = set; then

    # 'PERL' is set in the user's environment.

    candidate_perl_names="$PERL"

    perl_specified=yes

  else

    candidate_perl_names='perl perl5'

    perl_specified=no

  fi

  found=no

  AC_SUBST([PERL])

  PERL="$am_missing_run perl"

  for perl in $candidate_perl_names; do

    # Run test in a subshell; some versions of sh will print an error if

    # an executable is not found, even if stderr is redirected.

    if ( $perl -e 'require 5.005; use File::Compare' ) > /dev/null 2>&1; then

      PERL=$perl

      found=yes

      break

    fi

  done

  AC_MSG_RESULT([$found])

  test $found = no && AC_MSG_WARN([

WARNING: You don't seem to have perl5.005 or newer installed, or you lack

         a usable version of the Perl File::Compare module.  As a result,

         you may be unable to run a few tests or to regenerate certain

         files if you modify the sources from which they are derived.

] )

])