def _extract_open_mpi(version_buffer_str):
    """
    Parses the typical OpenMPI library version message, eg:
    Open MPI v4.0.1, package: Open MPI Distribution, ident: 4.0.1, repo rev: v4.0.1, Mar 26, 2019
    """
    return version_buffer_str.split("v", 1)[1].split(",", 1)[0]