The macro changed name upstream. Try to keep up.
## Perl.
AC_ARG_VAR([PERL], [Path to your favourite Perl binary.])
AC_PATH_PROGS([PERL], [perl perl5], [false])
## Perl.
AC_ARG_VAR([PERL], [Path to your favourite Perl binary.])
AC_PATH_PROGS([PERL], [perl perl5], [false])
-AC_PROG_PERL_VERSION([5.004], [have_perl=yes], [have_perl=no])
+AX_PROG_PERL_VERSION([5.004], [have_perl=yes], [have_perl=no])
AM_CONDITIONAL([HAVE_PERL], [test $have_perl = yes])
AC_ARG_WITH(
AM_CONDITIONAL([HAVE_PERL], [test $have_perl = yes])
AC_ARG_WITH(