anchor.diff:  
     nativeBuildInputs = [ pkg-config ];
   
  -  buildInputs = [ openssl libbsd libuuid libmd zlib ncurses ];
  +  buildInputs = [ openssl libbsd libuuid libmd zlib ncurses ]
  +  ++ lib.optionals stdenv.isDarwin [ libossp_uuid ];
   
     doInstallCheck = true;
   
  
positive.code:     '';
      homepage = "https://gameoftrees.org";
      license = licenses.isc;
      platforms = platforms.linux;
      maintainers = with maintainers; [ abbe ];
    };
  }
  
negative.code: { lib, stdenv, fetchurl, pkg-config, openssl, libbsd, libuuid, libossp_uuid, libmd, zlib, ncurses }:
  
  stdenv.mkDerivation rec {
    pname = "got";
  