http://bugs.gentoo.org/362299

--- dict/stardict-plugins/stardict-wordnet-plugin/scene.h
+++ dict/stardict-plugins/stardict-wordnet-plugin/scene.h
@@ -25,6 +25,8 @@
 #ifndef __PHYSICS_H__
 #define __PHYSICS_H__
 
+#include <cstddef>
+
 #include "partic.h"
 #include "spring.h"