anchor.diff:    baseUrl = "mirror://kernel/linux/bluetooth";
   in
   stdenv.mkDerivation rec {
  -  name = "bluez-5.49";
  +  name = "bluez-5.50";
   
     src = fetchurl {
       url = "${baseUrl}/${name}.tar.xz";
       hashOutput = false;
  -    sha256 = "33301d7a514c73d535ee1f91c2aed1af1f2e53efe11d3ac06bcf0d7abed2ce95";
  +    sha256 = "5ffcaae18bbb6155f1591be8c24898dc12f062075a40b538b745bfd477481911";
     };
   
     buildInputs = [
  +    alsa-lib
       dbus
  +    ell
       glib
       json-c
       libical
  
positive.code:     "--enable-sap"
      "--enable-health"
      "--enable-mesh"
      "--enable-manpages"
      "--enable-sixaxis"
    ];
  
negative.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        inherit (src)
          urls
          outputHash
          outputHashAlgo;
        fullOpts = {
          pgpsigUrl = "${baseUrl}/${name}.tar.sign";
          pgpDecompress = true;
          pgpKeyFingerprint = "E932 D120 BC2A EC44 4E55  8F01 06CA 9F5D 1DCF 2659";
        };
      };
    };
  
  