--- deliantra/server/include/util.h	2006/09/02 22:57:55	1.1
+++ deliantra/server/include/util.h	2006/09/03 23:33:01	1.2
@@ -1,6 +1,12 @@
 #ifndef UTIL_H__
 #define UTIL_H__
 
+#if __GNUC__ >= 3
+# define is_constant(c) __builtin_constant_p (c)
+#else
+# define is_constant(c) 0
+#endif
+
 // makes dynamically allocated objects zero-initialised
 struct zero_initialised
 {