X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/381fb12e1e6c2f028685d102386bc32725d14f48..e91ff6ce3d2653b41265591dafd4bdb32ae114c2:/configure.in

diff --git a/configure.in b/configure.in
index 2cf4e6ff..818818af 100644
--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,6 @@
 # Configure template for GNU Bison.                   -*-Autoconf-*-
 #
-# Copyright 2001, 2002  Free Software Foundation, Inc.
+# Copyright (C) 2001, 2002 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -18,7 +18,7 @@
 # 02111-1307  USA
 
 # We need a recent Autoconf to run a recent Autotest.
-AC_PREREQ(2.52g)
+AC_PREREQ(2.53)
 
 AC_INIT([GNU Bison], [1.49a], [bug-bison@gnu.org])
 AC_CONFIG_AUX_DIR(config)
@@ -42,6 +42,11 @@ AC_ISC_POSIX
 AM_PROG_CC_STDC
 AC_PROG_RANLIB
 AM_MISSING_PROG([AUTOM4TE], [autom4te])
+BISON_PROG_GNU_M4
+if test x"$ac_cv_prog_gnu_m4" != xyes; then
+  AC_MSG_ERROR([GNU M4 1.4 is required])
+fi
+AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the GNU M4 executable name.])
 
 AC_ARG_ENABLE(gcc-warnings,
 [  --enable-gcc-warnings   turn on lots of GCC warnings (not recommended)],