anchor.diff:  { stdenv
   , lib
  -, fetchpatch
   , fetchurl
   , alsaLib
   , dbus
  
positive.code:   ];
  in stdenv.mkDerivation rec {
    pname = "bluez";
    version = "5.56";
  
    src = fetchurl {
      url = "mirror://kernel/linux/bluetooth/${pname}-${version}.tar.xz";
      sha256 = "sha256-WcTbqfyKripqX48S8ZvBsMLcJzVcfKMSPu0/5r19C50=";
    };
  
    buildInputs = [
  
negative.code:   ];
  
    outputs = [ "out" "dev" ] ++ lib.optional doCheck "test";
  
    postPatch = ''
      substituteInPlace tools/hid2hci.rules \
  