anchor.diff:  
     buildInputs = [
       qtbase qtimageformats gtk3 libappindicator-gtk3
  -    dee ffmpeg openalSoft minizip libopus alsaLib libpulseaudio range-v3
  +    dee ffmpeg_4 openalSoft minizip libopus alsaLib libpulseaudio range-v3
     ];
   
     enableParallelBuilding = true;
  
positive.code:     owner = "telegramdesktop";
      repo = "tdesktop";
      rev = "v${version}";
      sha256 = "19p4cjzk7jyhrd4sd8dq1r1zksff23zyg5rh5vlr3kqd372bffzz";
      fetchSubmodules = true;
    };
  
  
negative.code: { mkDerivation, lib, fetchFromGitHub, fetchsvn, fetchpatch
  , pkgconfig, pythonPackages, cmake, wrapGAppsHook, wrapQtAppsHook, gcc9
  , qtbase, qtimageformats, gtk3, libappindicator-gtk3, libnotify, xdg_utils
  , dee, ffmpeg_4, openalSoft, minizip, libopus, alsaLib, libpulseaudio, range-v3
  }:
  
  with lib;
  
  mkDerivation rec {
    pname = "telegram-desktop";
    version = "1.8.15";
    # Note: Due to our strong dependency on the Arch patches it's probably best
    # to also wait for the Arch update (especially if the patches don't apply).
  
  