--- src/economy/supply_list.h.old	2011-04-26 12:25:14.102136343 +0200
+++ src/economy/supply_list.h	2011-04-26 13:32:57.127500881 +0200
@@ -21,6 +21,7 @@
 #define SUPPLY_LIST_H
 
 #include <vector>
+#include <cstddef>
 
 namespace Widelands {