anchor.diff:    version = "3.1.2";
   
     buildInputs = [ setuptools_scm ];
  -  propagatedBuildInputs = [ py virtualenv pluggy six ];
  +  propagatedBuildInputs = [ packaging pluggy py six virtualenv ];
   
     doCheck = false;
   
  
positive.code: { buildPythonPackage
  , fetchPypi
  , py
  , virtualenv
  , pluggy
  , setuptools_scm
  , six
  }:
  
  buildPythonPackage rec {
  
negative.code:     inherit pname version;
      sha256 = "9f0cbcc36e08c2c4ae90d02d3d1f9a62231f974bcbc1df85e8045946d8261059";
    };
  
    meta = with lib; {
      description = "Virtualenv-based automation of test activities";
      homepage = https://tox.readthedocs.io/;
      license = licenses.mit;
    };
  }
  