anchor.diff:  
   rustPlatform.buildRustPackage rec {
     pname = "dogdns";
  -  version = "0.1.0";
  +  version = "unstable-2021-10-07";
   
     src = fetchFromGitHub {
       owner = "ogham";
       repo = "dog";
  -    rev = "v${version}";
  -    sha256 = "088ib0sncv0vrvnqfvxf5zc79v7pnxd2cmgp4378r6pmgax9z9zy";
  +    rev = "721440b12ef01a812abe5dc6ced69af6e221fad5";
  +    sha256 = "sha256-y3T0vXg7631FZ4bzcbQjz3Buui/DFxh9LG8BZWwynp0=";
     };
   
     nativeBuildInputs = [ installShellFiles ]
  
positive.code:     description = "Command-line DNS client";
      homepage = "https://dns.lookup.dog";
      license = licenses.eupl12;
      maintainers = with maintainers; [ bbigras ];
      mainProgram = "dog";
    };
  }
  
negative.code:   buildInputs = lib.optionals stdenv.isLinux [ openssl ]
      ++ lib.optionals stdenv.isDarwin [ Security ];
  
    cargoSha256 = "sha256-agepQVJbqbjzFbEBKbM7BNxc8FlklOrCsTgCAOcuptc=";
  
    postInstall = ''
      installShellCompletion completions/dog.{bash,fish,zsh}
  