[Groff] autoconf for GROFF_PERL

[Bernd Warken]

I tried to get autoconf into breaking by wrong Perl version  or no Perl at all.

########## add to <top>/m4/groff.m4:
# We need Perl 5.6.1 or newer.

AC_DEFUN([GROFF_PERL],
        PERLVERSION=v5.6.1
        AC_PATH_PROG([PERLPATH], [perl], [/usr/bin/perl])
        if test -z "$PERLPATH"; then
           AC_MSG_ERROR([perl not found])
        fi
        $PERLPATH -e "require $PERLVERSION" || \
           AC_MSG_ERROR([perl version to old])
         AC_SUBST([PERLPATH])
         AC_SUBST([PERLVERSION]))
##########

########## replace in <top>/configure.ac:
# AC_PATH_PROG([PERLPATH], [perl], [/usr/bin/perl])
GROFF_PERL
##########


But autoconf seems not to work.  When I replace `perl' by `perl_wrong' or the
`PERLVERSION' by `v5.29.1' it should break.  Even configure runs without any
problem.

Bernd Warken