--- include/SFML/System/ResourcePtr.inl.orig	2010-01-27 16:53:54.000000000 +0300
+++ include/SFML/System/ResourcePtr.inl	2015-03-27 15:46:53.809250000 +0300
@@ -22,6 +22,7 @@
 //
 ////////////////////////////////////////////////////////////
 
+#include <cstddef>
 
 ////////////////////////////////////////////////////////////
 /// Default constructor