anchor.diff:      fi_info
   #export SHMEM_OFI_PROVIDER=sockets
   #export SHMEM_OFI_FABRIC="127.0.0.1/8"
  +    export OMPI_MCA_rmaps_base_oversubscribe=1
  +    export HYDRA_IFACE=lo
       export SHMEM_OFI_DOMAIN=lo
       make check TEST_RUNNER="mpiexec -n 2"
     '';
  
positive.code: { stdenv, fetchFromGitHub, autoconf, automake, libtool
  , rdma-core, libfabric, libnl, perl, openmpi, openssh
  } :
  
  let
    version = "1.4.0";
  
  in stdenv.mkDerivation {
    name = "sos-${version}";
  
negative.code:     "--with-ofi=${libfabric}"
    ];
  
    nativeBuildInputs = [ autoconf automake libtool mpi openssh ];
    buildInputs = [ rdma-core libfabric libnl perl ];
  
    enableParallelBuilding = true;
  