--- bison-2.4.3.orig/lib/config.hin	2010-08-06 03:00:25.000000000 +0200
+++ bison-2.4.3/lib/config.hin	2012-09-28 20:44:10.000000000 +0200
@@ -1350,6 +1350,9 @@
    accessed atomically even in the presence of asynchnonous signals. */
 #undef sig_atomic_t
 
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+#undef size_t
+
 /* Define to `int' if <sys/types.h> doesn't define. */
 #undef uid_t
 
