I've added several items to the checkout list see the updated list here:
http://jholsenback.wordpress.com/2013/11/17/pulling-pov-ray-3-7-source-from-github/
namely the 1st four items added to sparse-checkout ... for some reason
the libraries directory is also being picked up. Don't know why /yet/
... since it's not needed for nix source build I just deleted it.
