Installing charmm c41 on macOS Sierra

Register and download charmm c41 source code.

$ brew install gcc openmpi #GCC6

$ ln -s /usr/local/bin/gcc-6 /usr/local/bin/gcc
$ ln -s /usr/local/bin/g++-6 /usr/local/bin/g++

$ tar xvzf charmm.tar.gz
$ cd charmm
$ export MAKE_COMMAND="make -j4"
$ ./install.com gnu M  #using gnu C compiler not osx clang. Command "./install.com osx" returned an error "clang: error: unknown argument: '-fabi-version=0'."   "M" specifies MPI-enabled version.

$ ./install.com gnu

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