debian unstable && nvidia gforce ti

opengl works just fine, but i still get the following:

~/downloads/games/plantshift/planeshift$ ./psclient-bin
no CEL environment variable set!
Warning: Failed to load `gl3d\'; use \'-verbose\' argument for details.
Warning: Failed to load `gl3d\'; use \'-verbose\' argument for details.
WARNING: could not load plugin \'crystalspace.graphics3d.opengl\'
aws-debug: Couldn\'t find iGraphics2D plugin!!
psclient: No 3d driver (iGraphics3D) plugin!
~/downloads/games/plantshift/planeshift$

maybe the CEL environment variable is the problem? wtf is CEL?

thanks in advance for any hint... damn i have to get this game working!