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