Trouble building Ogre on OSX Snow Leopard

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I'm having trouble building ogre (and therefore rviz) with ROS Electric on OSX Snow Leopard (10.6.8) with Homebrew. I've followed the ROS on OSX directions at http://www.ros.org/wiki/electric/Installation/OSX/Homebrew

I have checked out the visualization_common-1.6.2 tag of visualization_common, as that seems to be the current version supported with electric.

I get this error when building, followed by a bunch of "FOO has not been declared" that I assume come from this missing header.

In file included from /Users/hendrix/ros/visualization_common/ogre/build/ogre_src_v1-7-3/PlugIns/CgProgramManager/include/OgreCgFxScriptLoader.h:35,
                 from /Users/hendrix/ros/visualization_common/ogre/build/ogre_src_v1-7-3/PlugIns/CgProgramManager/src/OgreCgFxScriptLoader.cpp:29:
/Users/hendrix/ros/visualization_common/ogre/build/ogre_src_v1-7-3/PlugIns/CgProgramManager/include/OgreCgPrerequisites.h:32:19: error: Cg/cg.h: No such file or directory

And eventually, the usual:

make[1]: *** [installed_osx] Error 1
BUILD FAILED: Plugin_CgProgramManager.dylib not created.   Is nvidia-cg-toolkit installed correctly?
make: *** [ogre] Error 1

rosdep install ogre claims that it has successfully installed the nvidia-cg-toolkit.

sudo find / -iname cg.h only finds:

/Library/Frameworks/Cg.framework/Versions/1.0/Headers/cg.h

Does anyone know if the newer versions of visualization_common (for Fuerte) are compatible with ROS Electric, and if they will solve this error?