diff -up meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Raytracer/RayTracer.cpp.glu meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Raytracer/RayTracer.cpp
--- meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Raytracer/RayTracer.cpp.glu	2011-06-06 01:48:49.000000000 -0600
+++ meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Raytracer/RayTracer.cpp	2011-10-21 13:33:56.119545281 -0600
@@ -6,6 +6,7 @@
 #include "SyntopiaCore/Math/Vector3.h"
 #include "SyntopiaCore/Logging/Logging.h"
 #include "SyntopiaCore/Misc/MiniParser.h"
+#include <GL/glu.h>
 
 using namespace SyntopiaCore::Math;
 using namespace SyntopiaCore::Misc;
diff -up meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Sphere.h.glu meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Sphere.h
--- meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Sphere.h.glu	2011-06-06 01:48:49.000000000 -0600
+++ meshlab-1.3.1/meshlab/src/external/structuresynth/ssynth/SyntopiaCore/GLEngine/Sphere.h	2011-10-21 13:31:11.786431683 -0600
@@ -2,6 +2,7 @@
 
 #include "SyntopiaCore/Math/Vector3.h"
 #include "Object3D.h"
+#include <GL/glu.h>
 
 namespace SyntopiaCore {
 	namespace GLEngine {