If your portstree is up2date you'll see that the port is at version 1.0.9741_1 and it includes zander's patch. So you don't need to patch it by hand.
- Add a patch by Christian Zander from nVidia that fixes crashes reported by
users on recent 6.X and -CURRENT systems. This applies to both versions,
9631 and 9746
LibGLU should be there btw. It's installed on my system.