Will removing the jansson-devel packages be beneficial at all compared to the workaround I described (editing the makefile)?  Regarding the NVIDIA drivers, I remember doing something with akmod-nvidia, but that may have been prior to mining, I downloaded the propietary binary package at some point as well, but I may have only installed it on an older version.  I think I installed the CUDA toolkit by extracting it per NVIDIA's instructions, but I don't think it is used.  I had trouble with it throwing an error about gcc 4.5 and greater not being supported trying to compile something a while back and couldn't figure out how to get it to recognize that I was using gcc34 as a compiler.  Also, I think the gpu mining compiled fine in this case because I also installed the ATI SDK, so I think it used the OpenCL drivers from the ATI SDK and not the CUDA toolkit.  Come to think of it, the working phoenix and poclbm came from git and weren't compiled by me, but I'd still expect them to use the same OpenCL driver.