anchor.diff:  
   stdenv.mkDerivation rec {
     name = "bluez-5.37";
  -   
  +
     src = fetchurl {
       url = "mirror://kernel/linux/bluetooth/${name}.tar.xz";
       sha256 = "c14ba9ddcb0055522073477b8fd8bf1ddf5d219e75fdfd4699b7e0ce5350d6b0";
  
positive.code:       readline libsndfile udev libical
        # Disables GStreamer; not clear what it gains us other than a
        # zillion extra dependencies.
        # gstreamer gst_plugins_base 
      ];
  
    patches = [ ./bluez-5.37-obexd_without_systemd-1.patch ];
      
    preConfigure = ''
        substituteInPlace tools/hid2hci.rules --replace /sbin/udevadm ${systemd}/bin/udevadm
        substituteInPlace tools/hid2hci.rules --replace "hid2hci " "$out/lib/udev/hid2hci "
  
negative.code:   # FIXME: Move these into a separate package to prevent Bluez from
    # depending on Python etc.
    postInstall = ''
      mkdir -p $test/test
      cp -a test $test
      pushd $test/test
      for a in \
              simple-agent \
              test-adapter \
  