anchor.diff:    tg_owt = callPackage ./tg_owt.nix {};
   in mkDerivation rec {
     pname = "telegram-desktop";
  -  version = "2.8.1";
  +  version = "2.8.3";
  +  # Note: Update via pkgs/applications/networking/instant-messengers/telegram/tdesktop/update.py
   
     # Telegram-Desktop with submodules
     src = fetchFromGitHub {
  
positive.code:     repo = "tdesktop";
      rev = "v${version}";
      fetchSubmodules = true;
      sha256 = "1wf9806al6mzyd8nr37cdk6q2r354acixdqyjchi4r58drm99yv0";
    };
  
    postPatch = ''
  
negative.code: 
    passthru = {
      inherit tg_owt;
      updateScript = ./update.py;
    };
  
    meta = {
  