anchor.diff:  assert sambaSupport -> samba != null;
   assert vdpauSupport -> libvdpau != null && ffmpeg.vdpauSupport;
   assert pulseSupport -> pulseaudio != null;
  +assert cecSupport   -> libcec != null;
   
   stdenv.mkDerivation rec {
       name = "xbmc-13.2";
  
positive.code:           --prefix LD_LIBRARY_PATH ":" "${curl}/lib" \
            --prefix LD_LIBRARY_PATH ":" "${systemd}/lib" \
            --prefix LD_LIBRARY_PATH ":" "${libmad}/lib" \
            --prefix LD_LIBRARY_PATH ":" "${libvdpau}/lib"
        done
      '';
  
  
negative.code: # TODO: librtmp
  , libvdpau ? null, vdpauSupport ? true
  , pulseaudio ? null, pulseSupport ? true
  , libcec ? null, cecSupport ? true
  }:
  
  assert dbusSupport  -> dbus_libs != null;
  