CGL doesn't have anything like glXGetProcAddress, and the old code just called down to dlsym in any case. It's a little mind-warping since dlopening a framework actually loads multiple dylibs, but that's just how OSX rolls. Signed-off-by: Adam Jackson <ajax@redhat.com> Reviewed-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>