anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${name}.tar.xz";
  -    sha256 = "0xf58zld6pnfa8k7k70rv8ya8g7zqgahz6q4sapwxs6k97d2fgsx";
  +    sha256 = "143zapq50lggj3mpqg2y4rh1hgnkbn9vgvzpqxr7waiawsmx0awq";
     };
   
     nativeBuildInputs = [
  
positive.code: 
    mesonFlags = [
      "-Ddbus_services=share/dbus-1/services"
      # TODO: figure out wrapping unit tests, some of them fail on missing gsettings-desktop-schemas
      "-Dfunctional_tests=false"
    ];
  
    postPatch = ''
  
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}";
  
  