Got the GPU miner working with a AMD Radeon R7 250 2GB DDR3 on Ubuntu Linux.

Its doing around 40000 pps (including the dual core CPU) - just need to disable one (or both) of the CPU cores and get the GPU overclocked. Sure that the GPU can do a lot more pps overclocked - without the 100% CPU clogging the processes.

Having previously installed both bfgminer and sph_miner prerequisites on my testing box - I found I was missing the following packages:

sudo apt-get install libgmp-dev

sudo apt-get install libmpfr-dev

sudo apt-get install libboost-all-dev

sudo apt-get install libglu-dev