* m4/m4.m4: New, from CVS Autoconf.

[bison.git] / configure.in

diff --git a/configure.in b/configure.in
index 2cf4e6ffed1099d269c8ec5e81611ef4a6d27e08..654caf2914064dc155516eac226c33d0447b31f5 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -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)],