anchor.diff:      sha256 = "48d9be622049d8363cda84125c45d18b89e0ab7d99be5a93c0246f375ebad344";
     };
   
  +  nativeBuildInputs = [
  +    setuptools-scm
  +  ];
  +
     propagatedBuildInputs = [
       numpy
       scipy
  
positive.code: , scipy
  , pytest
  , pybind11
  }:
  
  buildPythonPackage rec {
  
negative.code:     pybind11
    ];
  
    # failed with "ModuleNotFoundError: No module named 'pyamg.amg_core.evolution_strength'"
    doCheck = false;
    # taken from https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=python-pyamg#n27
    # checkPhase = ''
    #   PYTHONPATH="$PWD/build/lib.linux-*:$PYTHONPATH" ${python3.interpreter} -c "import pyamg; pyamg.test()"
    # '';
  
    pythonImportsCheck = [
      "pyamg"
      "pyamg.amg_core.evolution_strength"
    ];
  
    meta = with lib; {
      description = "Algebraic Multigrid Solvers in Python";
  