anchor.diff:    ];
   
     checkInputs = [
  -    pytest
  +    pytestCheckHook
       matplotlib
  -    perfplot
     ];
   
     postConfigure = ''
  
positive.code: , pybind11
  , pyfma
  , eigen
  , pytest
  , matplotlib
  , perfplot
  , isPy27
  }:
  
  
negative.code:     export HOME=$(mktemp -d)
    '';
  
    # performance tests aren't useful to us and disabling them allows us to
    # decouple ourselves from an unnecessary build dep
    preCheck = ''
      for f in test/test*.py ; do
        substituteInPlace $f --replace 'import perfplot' ""
      done
    '';
    disabledTests = [ "test_speed_comparison1" "test_speed_comparison2" ];
    pythonImportsCheck = [ "accupy" ];
  
    meta = with lib; {
      description = "Accurate sums and dot products for Python";
  