anchor.diff:  { lib, buildPythonApplication, fetchPypi
   , installShellFiles, pbr
  -, flake8, mock, pycodestyle, pylint, tox
  +, flake8, mock, pycodestyle, pylint, stestr, tox
   , nix-update-script
   , testVersion, git-machete
   }:
  
positive.code:     description = "Git repository organizer and rebase/merge workflow automation tool";
      license = licenses.mit;
      platforms = platforms.all;
      maintainers = [ maintainers.blitz ];
    };
  }
  
negative.code: 
    nativeBuildInputs = [ installShellFiles pbr ];
  
    checkInputs = [ flake8 mock pycodestyle pylint stestr tox ];
  
    postInstall = ''
        installShellCompletion --bash --name git-machete completion/git-machete.completion.bash
  