I'm not having much luck compiling this on Fedora 15. This is where make craps out:
You have a conflict between jansson-1.2 which is included with Fedora and jansson-2.0 which comes with cgminer. Remove the jansson-devel packages and you'll be able to finish the build.
but will get this upon running cgminer:
[2011-07-20 12:41:07] Error: Getting Device IDs (num)
I am running an nVidia card at the moment, but poclbm and phoenix can each access it.
How did you install the NVIDIA drivers and CUDA toolkit?