*`source /afs/cern.ch/sw/lcg/external/gcc/4.8/x86_64-slc6-gcc48-opt/setup.sh` (this configures your gcc)
*Setup compiler: either `source /cvmfs/sft.cern.ch/lcg/contrib/gcc/<GCC_VERSION>/<PLATFORM>/setup.sh` or `source /afs/cern.ch/sw/lcg/external/gcc/${GCC_VERSION}/<PLATFORM>/setup.sh`