anchor.diff:      pkg-config
     ];
   
  -  buildInputs = [ openssl systemd ];
  +  buildInputs = [ openssl ]
  +    ++ stdenv.lib.optionals stdenv.isLinux [ systemd ]
  +    ++ stdenv.lib.optionals stdenv.isDarwin [ darwin.Security ];
   
     cargoBuildFlags = [ "--features final" ];
   
  
positive.code:     homepage = "http://parity.io/ethereum";
      license = licenses.gpl3;
      maintainers = with maintainers; [ akru xrelkd ];
      platforms = platforms.linux;
    };
  }
  
negative.code: , llvmPackages
  , openssl
  , pkg-config
  , stdenv
  , systemd
  , darwin
  }:
  
  rustPlatform.buildRustPackage rec {
  