anchor.diff:  
       security.setuidOwners = singleton
         { program = "dbus-daemon-launch-helper";
  -        source = "${dbus}/libexec/dbus-daemon-launch-helper";
  +        source = "${pkgs.dbus_daemon}/libexec/dbus-daemon-launch-helper";
           owner = "root";
           group = "messagebus";
           setuid = true;
  
positive.code: 
    cfg = config.services.dbus;
  
    inherit (pkgs) dbus;
  
    homeDir = "/var/run/dbus";
  
    configDir = pkgs.stdenv.mkDerivation {
  
negative.code:           -e 's|<standard_system_servicedirs/>|${systemServiceDirs}|' \
            -e 's|<includedir>system.d</includedir>|${systemIncludeDirs}|'
  
        cp ${pkgs.dbus_daemon}/etc/dbus-1/session.conf $out/session.conf
        
        # Add the services and session.d directories to the session bus
        # search path.
  