Any one up for OSX work.

I concur. There are no references that I can find.

Furthermore, the code:

ShaderGenerator *ShaderGenerator::
get_default() {
  if (_default_generator == (ShaderGenerator *)NULL) {
    _default_generator = new ShaderGenerator;
  }
  return _default_generator;
}

Can’t get much simpler…

GCC on Mac OS X returns 0 for undefined variables - same as NULL, so the if() should work.

So if this is the problem, then I’m stumped as well