https://bugzilla.redhat.com/show_bug.cgi?id=356971
coolkey.cpp:37:1: error: "NULL" redefined
In file included from /usr/include/alloca.h:25,
                 from /usr/include/stdlib.h:612,
                 from /usr/include/c++/4.3.0/cstdlib:73,
                 from /usr/include/c++/4.3.0/bits/stl_algo.h:65,
                 from /usr/include/c++/4.3.0/algorithm:67,
                 from slot.h:27,
                 from coolkey.cpp:33:
/usr/lib64/gcc/x86_64-suse-linux/4.3.0/include/stddef.h:400:1: error: this is the location of the previous definition
================================================================================
--- src/coolkey/coolkey.cpp
+++ src/coolkey/coolkey.cpp
@@ -34,8 +34,6 @@
 #include "cky_base.h"
 #include "params.h"
 
-#define NULL 0
-
 /* static module data --------------------------------  */
 
 static Log *log = NULL;