--- a/cubex.h	2010-07-10 06:30:30.027920523 +0000
+++ b/cubex.h	2010-07-10 06:30:49.724921222 +0000
@@ -12,6 +12,7 @@
 #define _CUBEX_H_
 
 // required includes/namespace
+#include <cstdlib>
 #include <string>
 using namespace std;