anchor.diff:        --replace /opt/Signal/signal-desktop $out/bin/signal-desktop
   
       autoPatchelf --no-recurse -- $out/lib/Signal/
  -    patchelf --add-needed ${libpulseaudio}/lib/libpulse.so $out/lib/Signal/resources/app.asar.unpacked/node_modules/ringrtc/build/linux/libringrtc.node
  +    patchelf --add-needed ${libpulseaudio}/lib/libpulse.so $out/lib/Signal/resources/app.asar.unpacked/node_modules/ringrtc/build/linux/libringrtc-x64.node
     '';
   
     postFixup = ''
  
positive.code: 
    src = fetchurl {
      url = "https://updates.signal.org/desktop/apt/pool/main/s/signal-desktop/signal-desktop_${version}_amd64.deb";
      sha256 = "0hkl8h49565kncvczv5fv4gak55lycygwb8i8igkgc4my0ykzs2z";
    };
  
    nativeBuildInputs = [
  
negative.code:       else "");
  in stdenv.mkDerivation rec {
    pname = "signal-desktop";
    version = "5.3.0"; # Please backport all updates to the stable channel.
    # All releases have a limited lifetime and "expire" 90 days after the release.
    # When releases "expire" the application becomes unusable until an update is
    # applied. The expiration date for the current release can be extracted with:
  