--- ./src/config.h.orig	2002-11-20 05:27:49.000000000 -0500
+++ ./src/config.h	2009-06-23 19:35:15.500808903 -0400
@@ -26,6 +26,7 @@
  *      $Id: config.h,v 1.20 2002/11/20 10:27:49 ianf Exp $
  */
 
+#undef NULL
 #define NULL	0
 #define TRUE	1
 #define FALSE	0