Installation of Open-mpi on Mac OS X

Installation of Open MPI is fairly straightforward

https://www.open-mpi.org/software/ompi/v2.0/

tar xf openmpi-4.1.4.tar
cd openmpi-4.1.4/
./configure –prefix=$HOME/opt/usr/local
make all
make install
$HOME/opt/usr/local/bin/mpirun –version
mpirun (Open MPI) 4.1.4