anchor.diff:  { lib, stdenv, fetchurl, dpkg
   , alsa-lib, atk, cairo, cups, curl, dbus, expat, fontconfig, freetype, gdk-pixbuf, glib, glibc, gnome2, gnome
   , gtk3, libappindicator-gtk3, libnotify, libpulseaudio, libsecret, libv4l, nspr, nss, pango, systemd, wrapGAppsHook, xorg
  -, at-spi2-atk, libuuid, at-spi2-core, libdrm, mesa, libxkbcommon }:
  +, at-spi2-atk, libuuid, at-spi2-core, libdrm, mesa, libxkbcommon, libxshmfence }:
   
   let
   
     # Please keep the version x.y.0.z and do not update to x.y.76.z because the
     # source of the latter disappears much faster.
  -  version = "8.69.0.77";
  +  version = "8.75.0.140";
   
     rpath = lib.makeLibraryPath [
       alsa-lib
  
positive.code:     description = "Linux client for skype";
      homepage = "https://www.skype.com";
      license = licenses.unfree;
      maintainers = with lib.maintainers; [ panaeon jraygauthier ];
      platforms = [ "x86_64-linux" ];
    };
  }
  
negative.code:     libdrm
      mesa
      libxkbcommon
      libxshmfence
      xorg.libxkbfile
      xorg.libX11
      xorg.libXcomposite
  