--- 2.0-ongoing/libs/sigc++2/sigc++/signal_base.h.orig	2011-05-14 13:58:23.365742291 +0200
+++ 2.0-ongoing/libs/sigc++2/sigc++/signal_base.h	2011-05-14 13:58:40.849074889 +0200
@@ -22,6 +22,7 @@
 #define _SIGC_SIGNAL_BASE_H_
 
 #include <list>
+#include <cstddef>
 #include <sigc++config.h>
 #include <sigc++/type_traits.h>
 #include <sigc++/trackable.h>