anchor.diff:  
     mesonFlags = [
       "-Ddbus_services=share/dbus-1/services"
  +    "-Dsystemd_user_services=lib/systemd/user"
       # TODO: figure out wrapping unit tests, some of them fail on missing gsettings-desktop-schemas
       "-Dfunctional_tests=false"
  +  ];
  +
  +  patches = [
  +    # Always generate tracker-sparql.h in time
  +    (fetchurl {
  +      url = https://gitlab.gnome.org/GNOME/tracker/commit/3cbfaa5b374e615098e60eb4430f108b642ebe76.diff;
  +      sha256 = "0smavzvsglpghggrcl8sjflki13nh7pr0jl2yv6ymbf5hr1c4dws";
  +    })
     ];
   
     postPatch = ''
  
positive.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${name}.tar.xz";
      sha256 = "0xf58zld6pnfa8k7k70rv8ya8g7zqgahz6q4sapwxs6k97d2fgsx";
    };
  
    nativeBuildInputs = [
  
negative.code: { stdenv, fetchurl, fetchFromGitLab, intltool, meson, ninja, pkgconfig, gobjectIntrospection, python2
  , gtk-doc, docbook_xsl, docbook_xml_dtd_412, docbook_xml_dtd_43, glibcLocales
  , libxml2, upower, glib, wrapGAppsHook, vala, sqlite, libxslt, libstemmer
  , gnome3, icu, libuuid, networkmanager, libsoup, json-glib }:
  
  let
    pname = "tracker";
    version = "2.1.6";
  in stdenv.mkDerivation rec {
    name = "${pname}-${version}";
  
  