when ever i load a example sketch, or a sketch from the forums that use opengl and the line

  GL gl = renderer.gl;

i get the following error

renderer.gl cannot be resolved

am i right in thinking i don't have the openGL libraries installed correctly?.

is this related to graphic card drivers?  if so i'm running a ati HD 3600 gfx card, and i'm aware that ati are a bit crap when it comes to OpenGL. i've got the most up to date drivers, and have even tried old drivers that have fixed other opengl issues with games.

any help would be useful, and i'm not sure what else to try.