--- apps/openmw/mwworld/projectilemanager.hpp.orig	2016-01-12 16:11:28 UTC
+++ apps/openmw/mwworld/projectilemanager.hpp
@@ -3,6 +3,7 @@
 
 #include <string>
 
+#include <osg/observer_ptr>
 #include <osg/ref_ptr>
 #include <osg/PositionAttitudeTransform>