diff -up supertux-0.3.3/src/supertux/screen_manager.hpp.cstddef supertux-0.3.3/src/supertux/screen_manager.hpp
--- supertux-0.3.3/src/supertux/screen_manager.hpp.cstddef	2010-03-01 13:40:58.000000000 +0100
+++ supertux-0.3.3/src/supertux/screen_manager.hpp	2011-06-30 11:05:35.617530353 +0200
@@ -18,6 +18,7 @@
 #define HEADER_SUPERTUX_SUPERTUX_MAINLOOP_HPP
 
 #include <memory>
+#include <cstddef>
 
 #include "scripting/thread_queue.hpp"