FindVTK.cmake, which has a bug). Let's see if that can help us to find out why we still have problems with demos on MacOS and Windows.
To compile this demo you need to have an OpenGL library, like:
freeglut-2.4.0
You have to set the option:
-I{your OpenGL folder}/freeglut-2.4.0/include (to compile) [The include files]
-L{your OpenGL folder}/freeglut-2.4.0/src/.libs/ (to link) [The lib files]