anchor.diff:  { lib
  +, stdenv
   , buildPythonPackage
   , fetchPypi
   , pythonOlder
   , dnspython
  -, enum34
   , greenlet
   , monotonic
   , six
  
positive.code:     sha256 = "2f0bb8ed0dc0ab21d683975d5d8ab3c054d588ce61def9faf7a465ee363e839b";
    };
  
    propagatedBuildInputs = [ dnspython greenlet monotonic six ]
      ++ lib.optional (pythonOlder "3.4") enum34;
  
    checkInputs = [ nose pyopenssl ];
  
    preCheck = ''
      echo "nameserver 127.0.0.1" > resolv.conf
  
negative.code:   # pythonImportsCheck = [ "eventlet" ];
  
    meta = with lib; {
      homepage = "https://github.com/eventlet/eventlet/";
      description = "A concurrent networking library for Python";
      maintainers = with maintainers; [ SuperSandro2000 ];
      license = licenses.mit;
  