How to make Gazebo use CUDA?

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A few things I've read so far:

• http://www.ros.org/wiki/diamondback#p...
• http://www.ros.org/wiki/parallel_quic...

So, with diamondback, assuming I have all the correct NVIDIA drivers and CUDA toolkit installed and working, does Gazebo automatically use CUDA? If not, then where are the files that the parallel_quickstep instructions point to? Namely, "Makefile.gazebo.cuda" and "cuda.patch"? They're not in my gazebo directory by default after a diamondback install.

Thanks, Sean