One or two things towards gettings it working on Linux.

At least now it _attempts_ to build the example :)

examples/OpenGL/CMakeLists.txt

@@ -40,7 +40,7 @@ SET(QT_USE_QTGUI 1)
 SET(QT_USE_QTOPENGL 1)
 INCLUDE(${QT_USE_FILE})
 
-IF (WIN32)
+#IF (WIN32)
 	FIND_PACKAGE(OpenGL REQUIRED)
 
 	#NOTE:  In Windows I haven't had much luck getting the FindGLUT script to work correctly. 
@@ -65,4 +65,4 @@ IF (WIN32)
 	)
 	
 	ADD_DEPENDENCIES(OpenGLExample PolyVoxCore) #This shouldn't be needed
-ENDIF (WIN32)
+#ENDIF (WIN32)

examples/OpenGL/OpenGLWidget.h

@@ -4,7 +4,7 @@
 #ifdef WIN32
 #include "glew/glew.h"
 #else
-#include <gl/gl.h>     // The GL Header File
+#include <GL/gl.h>     // The GL Header File
 #endif
 
 #include <QGLWidget>

examples/OpenGL/main.cpp

@@ -9,7 +9,9 @@
 
 #include "OpenGLWidget.h"
 
+#ifdef WIN32
 #include <windows.h>   // Standard Header For Most Programs
+#endif
 
 #include <QApplication>