anchor.diff:  { stdenv, fetchFromGitHub, lib
  -, intltool, glib, pkgconfig, polkit, python, sqlite, systemd
  +, intltool, glib, pkgconfig, polkit, python, sqlite
   , gobjectIntrospection, vala_0_38, gtk-doc, autoreconfHook, autoconf-archive
   # TODO: set enableNixBackend to true, as soon as it builds
   , nix, enableNixBackend ? false, boost
   , enableCommandNotFound ? false
  -, enableBashCompletion ? false, bash-completion ? null }:
  +, enableBashCompletion ? false, bash-completion ? null
  +, enableSystemd ? stdenv.isLinux, systemd }:
   
   stdenv.mkDerivation rec {
     name = "packagekit-${version}";
  
positive.code:   '';
  
    configureFlags = [
      "--enable-systemd"
      "--disable-dummy"
      "--disable-cron"
      "--disable-introspection"
  
negative.code:     '';
      homepage = http://www.packagekit.org/;
      license = licenses.gpl2Plus;
      platforms = platforms.darwin;
      maintainers = with maintainers; [ matthewbauer ];
    };
  }
  