Luke-Jr, what is the comand if you are just starting out fresh with your special poclbm and you don't already have it? (I'm no git expert). Does it depend on the normal poclbm (does that need to be installed first)?
git clone git://github.com/m0mchil/poclbm.git && cd poclbm && git fetch https://git.gitorious.org/~Luke-Jr/bitcoin/luke-jrs-poclbm.git bugfix_difficulty_error && git merge FETCH_HEAD