message: In .travis.yml, for Mac, try installing openmpi without fortran.
  [skip appveyor]
diff: @@ -104,11 +104,8 @@ matrix:
  before_install:
  # No addon for brew yet, have to install OSX packages this way.
  - - if [ $TRAVIS_OS_NAME == "osx" ]; then
  - rvm get stable;
  - if [ $MPI == "YES" ]; then
  - travis_wait brew install open-mpi;
  - fi;
  + - if [ $TRAVIS_OS_NAME == "osx" ] && [ $MPI == "YES" ]; then
  + brew install open-mpi --without-fortran;
  fi
  # Update environment to find g++ 4.9 installation first.
  