anchor.diff:  
     config = mkIf cfg.enable {
   
  -    environment.systemPackages = [ dbus.daemon dbus.tools ];
  +    environment.systemPackages = [ pkgs.dbus_daemon pkgs.dbus_tools ];
   
       environment.etc = singleton
         { source = configDir;
  
positive.code:             chown messagebus ${homeDir}
  
              mkdir -m 0755 -p /var/lib/dbus
              ${dbus.tools}/bin/dbus-uuidgen --ensure
   
              rm -f ${homeDir}/pid
            '';
  
          daemonType = "fork";
  
          exec = "${dbus}/bin/dbus-daemon --system";
  
          postStop =
            ''
  
negative.code:     buildCommand = ''
        ensureDir $out
        
        cp -v ${pkgs.dbus_daemon}/etc/dbus-1/system.conf $out/system.conf
  
        # !!! Hm, these `sed' calls are rather error-prone...
  
  