anchor.diff:      restrict 127.0.0.1
       restrict -6 ::1
   
  -    ${toString (map (server: "server " + server + " iburst\n") config.services.ntp.servers)}
  +    ${toString (map (server: "server " + server + " iburst\n") cfg.servers)}
     '';
   
  -  ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup";
  +  ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup ${toString cfg.extraFlags}";
   
   in
   
  
positive.code:         description = ''
            The set of NTP servers from which to synchronise.
          '';
        };
  
      };
  
negative.code: let
  
    inherit (pkgs) ntp;
  
    cfg = config.services.ntp;
  
    stateDir = "/var/lib/ntp";
  
  