$ wget https://download.open-mpi.org/release/open-mpi/v3.1/openmpi-3.1.6.tar.gz
$ tar xvf openmpi-3.1.6.tar.gz
$ cd openmpi-3.1.6/
$ mkdir build
$ cd build
$ ../configure --prefix=/opt/openmpi/3.1.6 CC=gcc CXX=g++ --enable-mpi-cxx
$ make
$ make check
$ make test