{
  stdenv
, icc
, mpi ? null
, tampi ? null
, mcxx ? null
, gitBranch ? "garlic/mpi+isend+seq"
, gitCommit ? null
, garlicTools
}:

assert !(tampi != null && mcxx == null);

with stdenv.lib;

let
  gitSource = garlicTools.fetchGarlicApp {
    appName = "hpccg";
    inherit gitCommit gitBranch;
    gitTable = import ./git-table.nix;
  };
in
stdenv.mkDerivation rec {
  name = "hpccg";

  inherit (gitSource) src gitBranch gitCommit;

  programPath = "/bin/test_HPCCG-mpi.exe";

  buildInputs = [
    icc
  ]
  ++ optional (mpi != null) mpi
  ++ optional (tampi != null) tampi
  ++ optional (mcxx != null) mcxx;

  # The hpccg app fails to compile in parallel. Makefile must be fixed before.
  enableParallelBuilding = false;

  makeFlags = [
    "USE_MPI=-DUSING_MPI"
  ]
  ++ optional (tampi != null) "TAMPI_HOME=${tampi}";

  dontPatchShebangs = true;

  installPhase = ''
    echo ${tampi}
    mkdir -p $out/bin
    cp test_HPCCG-mpi.exe $out/bin
  '';

}