{ lib
, buildPythonPackage
, fetchPypi
, numpy
, scipy
, pyamg
, pysparse
, future
, matplotlib
, tkinter
, mpi4py
, scikit-fmm
, isPy27
, gmsh
, python
, stdenv
}:

let
  not_darwin_inputs = lib.optionals (! stdenv.isDarwin) [ gmsh ];
in
  buildPythonPackage rec {
    pname = "fipy";
    version = "3.3";

    src = fetchPypi {
      pname = "FiPy";
      inherit version;
      sha256 = "11agpg3d6yrns8igkpml1mxy3mkqkjq2yrw1mw12y07dkk12ii19";
    };

    propagatedBuildInputs = [
      numpy
      scipy
      pyamg
      matplotlib
      tkinter
      mpi4py
      future
      scikit-fmm
    ] ++ lib.optionals isPy27 [ pysparse ] ++ not_darwin_inputs;

    checkInputs = not_darwin_inputs;

    checkPhase = ''
      ${python.interpreter} setup.py test --modules
    '';

    meta = with lib; {
      homepage = https://www.ctcms.nist.gov/fipy/;
      description = "A Finite Volume PDE Solver Using Python";
      license = licenses.free;
      maintainers = with maintainers; [ costrouc wd15 ];
    };
  }