anchor.diff:  , lib
   , pythonOlder
   
  +, asn1crypto
   , cffi
   , enum34
   , idna
   , ipaddress
   , openssl
  -, pyasn1
  +, packaging
   , six
   }:
   
  
positive.code:   src = fetchPyPi {
      package = "cryptography";
      inherit version;
      sha256 = "878cb68b3da3d493ffd68f36db11c29deee623671d3287c3f8d685117ffda9a9";
    };
  
    buildInputs = [
  
negative.code:   ];
  
    propagatedBuildInputs = [
      asn1crypto
      cffi
      idna
      ipaddress
      packaging
    ] ++ optionals (pythonOlder "3.4") [
      enum34
    ];
  