error: 'gluProject' was not declared in this scope

http://bugs.gentoo.org/402361

--- libs/libGraphics/GLRenderEngine.cpp
+++ libs/libGraphics/GLRenderEngine.cpp
@@ -20,6 +20,7 @@
 #include <qimage.h>
 #include <qpainter.h>
 #include <QtOpenGL>
+#include <GL/glu.h>
 #include <math.h>
 #include "IEEEFP.hpp"