anchor.diff:  
     src = fetchPypi {
       inherit pname version;
  -    hash = "sha256-lT9jAanfigkfqI1V7tOUqIv5mIzei+NBd1NUkQkYwZY=";
  +    hash = "sha256-2s7xVJwSdffS1v7NLyz6O6ozB9AJpRTAwjIDP2uqXSE=";
     };
   
     LC_ALL = "en_US.UTF-8";
  
positive.code:     gpgme
      pkgs.gnupg
      mock
    ];
  
    doCheck = !stdenv.isDarwin;
  
negative.code: , mock
  , pkgs
  , urllib3
  , paramiko
  , pythonOlder
  }:
  
  buildPythonPackage rec {
    version = "0.20.36";
    pname = "dulwich";
    format = "setuptools";
  
  