anchor.diff:    src = fetchPyPi {
       package = "M2Crypto";
       inherit version;
  -    sha256 = "82317459d653322d6b37f122ce916dc91ddcd9d1b814847497ac796c4549dd68";
  +    sha256 = "a0fea2c5ab913e42864d1ccbaee5878c23886368b606e923609fda4ce37d26c0";
     };
   
     nativeBuildInputs = [
  
positive.code:     typing
    ];
  
    meta = with stdenv.lib; {
      maintainers = with maintainers; [
        wkennington
      ];
  
negative.code: { stdenv
  , buildPythonPackage
  , fetchPyPi
  , lib
  , swig
  
  , openssl
  