$NetBSD$

--- ./src/coolkey/coolkey.cpp.orig	2007-02-14 12:54:01.000000000 -0700
+++ ./src/coolkey/coolkey.cpp
@@ -34,7 +34,9 @@
 #include "cky_base.h"
 #include "params.h"
 
+#ifndef NULL
 #define NULL 0
+#endif
 
 /* static module data --------------------------------  */