Supposedly these have been "ported" to macosx, but unfortunately the make process for gdal is way off for MacOSX. I get libraries with no symbols, missing files when I try to make isntall. Not sure what's up with it. Demeter (www.terrainengine.com) needs a full port. It only relies on OpenGL, and optionally SDL, SDL_image, and.. gdal.
Thanks.
Jeremy Bell
WolverineSoft Project Coordinator
WolverineSoft Web Page