anchor.diff:          --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
           --set-rpath "${rpath}:$out/share/mattermost-desktop" \
           $out/share/mattermost-desktop/mattermost-desktop
  +
  +      runHook postInstall
       '';
   
       meta = with lib; {
  
positive.code:     dontConfigure = true;
      dontPatchELF = true;
  
      buildInputs = [ wrapGAppsHook gtk3 hicolor-icon-theme ];
  
      installPhase = ''
        mkdir -p $out/share/mattermost-desktop
        cp -R . $out/share/mattermost-desktop
  
  
negative.code: in
    stdenv.mkDerivation rec {
      pname = "mattermost-desktop";
      version = "4.6.2";
  
      src =
        if stdenv.hostPlatform.system == "x86_64-linux" then
          fetchurl {
            url = "https://releases.mattermost.com/desktop/${version}/${pname}-${version}-linux-x64.tar.gz";
            sha256 = "0i836bc0gx375a9fm2cdxg84k03zhpx1z6jqxndf2m8pkfsblc3x";
          }
        else if stdenv.hostPlatform.system == "i686-linux" then
          fetchurl {
            url = "https://releases.mattermost.com/desktop/${version}/${pname}-${version}-linux-ia32.tar.gz";
            sha256 = "04jv9hkmkh0jipv0fjdprnp5kmkjvf3c0fah6ysi21wmnmp5ab3m";
          }
        else
          throw "Mattermost-Desktop is not currently supported on ${stdenv.hostPlatform.system}";
  