I installed PyOpenGL and tried the demons. All demos except the one's using GLE are working. I wanted to mainly use GLE but get following error if I call any GLE function: 

OpenGL.error.NullFunctionError: Attempt to call an undefined function gleSetJoinStyle, check for bool(gleSetJoinStyle) before calling

I am using a Macbook pro (version 10.8.5). Any help would be appreciated.

thank you,