* Make the X11 dependency in PulseAudio optional, just like the JACK

  dependency.  This is important to prevent these dependencies from
  propagating to all PulseAudio clients.  The PulseAudio server in
  NixOS can enable X11 support (if desired) by setting

    hardware.pulseaudio.package = pkgs.pulseaudio.override {
      x11Support = true;
    };

svn path=/nixpkgs/trunk/; revision=30300