Fix CMake-on-gcc problem.
Fix CMake-on-gcc problem.

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