anchor.diff:  
     passthru = {
       inherit tg_owt;
  +    updateScript = ./update.py;
     };
   
     meta = {
  
positive.code:     repo = "tdesktop";
      rev = "v${version}";
      fetchSubmodules = true;
      sha256 = "1wf9806al6mzyd8nr37cdk6q2r354acixdqyjchi4r58drm99yv0";
    };
  
    postPatch = ''
  
negative.code:   tg_owt = callPackage ./tg_owt.nix {};
  in mkDerivation rec {
    pname = "telegram-desktop";
    version = "2.8.3";
    # Note: Update via pkgs/applications/networking/instant-messengers/telegram/tdesktop/update.py
  
    # Telegram-Desktop with submodules
    src = fetchFromGitHub {
  