anchor.diff:  { stdenv
   , lib
   , fetchurl
  -, fetchpatch
   , gettext
   , meson
   , ninja
  
positive.code: 
      dbus-run-session \
        --config-file=${dbus.daemon}/share/dbus-1/session.conf \
        meson test --print-errorlogs
  
      runHook postCheck
    '';
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "tracker";
    version = "3.3.0.beta";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "JvOoH1FOWsz8mBcpWAOK9Mw421rdp2u7yaB8gnorGjs=";
    };
  
    patches = [
      (substituteAll {
        src = ./fix-paths.patch;
        inherit asciidoc;
      })
    ];
  
  