# yum install openmpi openmpi-devel
export MPI_ROOT=/usr/lib64/openmpi
export PATH=${MPI_ROOT}/bin:${PATH}
export LD_LIBRARY_PATH=${MPI_ROOT}/lib:${LD_LIBRARY_PATH}
export C_INCLUDE_PATH=/usr/include/openmpi-x86_64:${C_INCLUDE_PATH}
export CPLUS_INCLUDE_PATH=$C_INCLUDE_PATH