One should always rebuild the source whenever possible. It seems to be a rule of thumb in the linux world. Getting the premade rpm's is for lazy people. I believe that rebuilding rpms for your particular system is more stable and reliable.
Anyways I wouldnt worry to much about the libGL error. I think i even got that one. also you should try and use the drivers before version 4191. I have noticed extremely slow 2D performance in X, using 4191.