anchor.diff:  { stdenv, buildPythonPackage, fetchPypi
  -, pytest, mock, pytestcov, coverage }:
  +, coverage
  +, mock
  +, pytest
  +, pytestcov
  +, setuptools
  +}:
   
   buildPythonPackage rec {
     pname = "gunicorn";
  
positive.code:       --replace "coverage>=4.0,<4.4" "coverage"
    '';
  
    # Test failures but patch does not apply cleanly
    # https://github.com/benoitc/gunicorn/commit/f38f717539b1b7296720805b8ae3969c3509b9c1
    doCheck = false;
  
    meta = with stdenv.lib; {
      homepage = https://pypi.python.org/pypi/gunicorn;
  
negative.code:     sha256 = "fa2662097c66f920f53f70621c6c58ca4a3c4d3434205e608e121b5b3b71f4f3";
    };
  
    propagatedBuildInputs = [ setuptools ];
  
    checkInputs = [ pytest mock pytestcov coverage ];
  
    prePatch = ''
  