anchor.diff:  in
     stdenv.mkDerivation rec {
       pname = "mattermost-desktop";
  -    version = "4.2.3";
  +    version = "4.3.1";
   
       src =
         if stdenv.hostPlatform.system == "x86_64-linux" then
           fetchurl {
             url = "https://releases.mattermost.com/desktop/${version}/${pname}-${version}-linux-x64.tar.gz";
  -          sha256 = "14xyn8dp0xxl4j9xdsjik9p6srqdxbirgcgym2sv64p01w3kc9wf";
  +          sha256 = "076nv5h6xscbw1987az00x493qhqgrli87gnn57zbvz0acgvlhfv";
           }
         else if stdenv.hostPlatform.system == "i686-linux" then
           fetchurl {
             url = "https://releases.mattermost.com/desktop/${version}/${pname}-${version}-linux-ia32.tar.gz";
  -          sha256 = "063rrxw76mjz71wp9xd3ppkq3s017vrzms879r2cilypmay7fhgs";
  +          sha256 = "19ps9g8j6kp4haj6r3yfy4ma2wm6isq5fa8zlcz6g042ajkqq0ij";
           }
         else
           throw "Mattermost-Desktop is not currently supported on ${stdenv.hostPlatform.system}";
  
positive.code:     gnome2.GConf
      gtk3
      pango
      libX11
      libXScrnSaver
      libXcomposite
  
negative.code: freetype, fontconfig, dbus, libX11, xorg, libXi, libXcursor, libXdamage,
  libXrandr, libXcomposite, libXext, libXfixes, libXrender, libXtst,
  libXScrnSaver, nss, nspr, alsaLib, cups, expat, udev, wrapGAppsHook,
  hicolor-icon-theme, libuuid, at-spi2-core, at-spi2-atk }:
  
  let
    rpath = stdenv.lib.makeLibraryPath [
      alsaLib
      at-spi2-atk
      at-spi2-core
      atk
      cairo
      cups
  