anchor.diff:  
     meta = with stdenv.lib; {
       description = "Namespace control and lazy-import mechanism";
  -    homepage = https://bitbucket.org/hpk42/apipkg;
  +    homepage = "https://github.com/pytest-dev/apipkg";
       license = licenses.mit;
     };
   }
  
positive.code:   };
  
    nativeBuildInputs = [ setuptools_scm ];
    checkInputs = [ pytest_3 ];
  
    checkPhase = ''
      py.test
  
negative.code: { stdenv, buildPythonPackage, fetchPypi
  , pytest, setuptools_scm }:
  
  buildPythonPackage rec {
    pname = "apipkg";
  