--- gui/model/representation.cpp.orig	2014-07-01 20:45:39.000000000 +0200
+++ gui/model/representation.cpp	2014-07-01 20:46:02.000000000 +0200
@@ -1,4 +1,5 @@
 #include "representation.h"
+#include <ostream>
 
 std::ostream &operator<<(std::ostream& os, const representation::t& r)
 {