--- a/sources/basics.h	Sun Jan 10 20:53:44 2016 +0200
+++ b/sources/basics.h	Mon Jan 11 01:56:32 2016 +0200
@@ -29,6 +29,8 @@
 */
 
 #pragma once
+#include <stdlib.h>
+
 #if !defined(_MSC_VER) && !defined(__cdecl)
 # define __cdecl
 #endif