--- src/buttonisedstate.h.orig	Sat Sep 16 05:10:50 2006
+++ src/buttonisedstate.h	Thu Mar 15 17:24:14 2007
@@ -20,6 +20,8 @@
 #ifndef BUTTONISEDSTATE_H
 #define BUTTONISEDSTATE_H
 
+#include <memory>
+
 #include <qobject.h>
 #include "dockstate.h"