Only build c++11 with gcc.
Only build c++11 with gcc.

robojukie/simbody,simbody/simbody,robojukie/simbody,simbody/simbody,elkingtonmcb/simbody,scamille/simbody,chrisdembia/simbody,chrisdembia/simbody,elkingtonmcb/simbody,Gjacquenot/simbody,scamille/simbody,robojukie/simbody,Gjacquenot/simbody,elen4/simbody,elen4/simbody,chrisdembia/simbody,Gjacquenot/simbody,elkingtonmcb/simbody,scamille/simbody