Ok so there you go: https://github.com/openframeworks/openFrameworks/pull/4430
Look at PR content if you want to know what such a cmake module config file does. Basically setting openFrameworks_INCLUDES and openFrameworks_LIBRARIES properly..
In my example CMake project using this, it looks like this:
So yeah that's basically it, working CMake project building against openFrameworks. All I need to do as of now is to set OPENFRAMEWORKS_ROOT in the environment before invoking cmake, due to the fact that oF is not (yet) deployed in a standard fashion, where if installed systemwide it would be found automatically, or, if installed in a custom location, I would need to set CMAKE_PREFIX_PATH as usual. If people want to test this after it's merged on VS and osx that would be great, since I can't.