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:     ++ lib.optional usbSupport libusb
      ++ lib.optional sambaSupport samba
      ++ lib.optional vdpauSupport libvdpau
      ++ lib.optional pulseSupport pulseaudio;
  
      dontUseCmakeConfigure = true;
  
  
negative.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" \
            --prefix LD_LIBRARY_PATH ":" "${libcec}/lib"
        done
      '';
  
  