OpenGL sample code on Linux

[Clemens Arth]

Hi,

I've tried to implement the OpenGL example in Aaron Hillegass' Cocoa 
Programming book (chapter 33) in gnustep. Unfortunately I couldn't get 
it to work - the window doesn't show anything.

Can someone provide me with a small simple OpenGL example in gnustep? I 
couldn't find anything useful googling...

Regards
Clemens