RenderManager compiles and links under OSX using the same CMakeLists.txt file that is used on other platforms. The OpenGL include file structure is different, so there are #defines in the code to let this compile on the mac.
As of 2/22/2016, only one RenderManager example program runs on the mac because the mac does not provide a Compatibility profile for OpenGL, but any application that uses only the Core profile should work on OSX.