anchor.diff:  in
     stdenv.mkDerivation rec {
       name = "mattermost-desktop-${version}";
  -    version = "4.1.2";
  +    version = "4.2.0";
   
       src =
         if stdenv.hostPlatform.system == "x86_64-linux" then
           fetchurl {
             url = "https://releases.mattermost.com/desktop/${version}/${name}-linux-x64.tar.gz";
  -          sha256 = "16dn6870bs1nfl2082ym9gwvmqb3i5sli48qprap80p7riph6k9s";
  +          sha256 = "0hka94gwpscjn61032c0grpjv5gjb0j8rkx6pgwci617n29xkyf6";
           }
         else if stdenv.hostPlatform.system == "i686-linux" then
           fetchurl {
             url = "https://releases.mattermost.com/desktop/${version}/${name}-linux-ia32.tar.gz";
  -          sha256 = "145zb1l37fa2slfrrlprlwzcc5km3plxs374yhgix25mlg2afkqr";
  +          sha256 = "1nx2sgbnr60h6kn56wv54m7cvyx27d64bfprpb94hqd5c2z21x80";
           }
         else
           throw "Mattermost-Desktop is not currently supported on ${stdenv.hostPlatform.system}";
  
positive.code:     gdk_pixbuf
      glib
      gnome2.GConf
      gtk2
      pango
      libX11
      libXScrnSaver
  
negative.code: { stdenv, lib, fetchurl, gnome2, gtk3, pango, atk, cairo, gdk_pixbuf, glib,
  freetype, fontconfig, dbus, libX11, xorg, libXi, libXcursor, libXdamage,
  libXrandr, libXcomposite, libXext, libXfixes, libXrender, libXtst,
  libXScrnSaver, nss, nspr, alsaLib, cups, expat, udev }:
  