anchor.diff:  
     config = mkIf config.services.ntp.enable {
   
  -    # Make tools such as ntpq available in the system path
  +    # Make tools such as ntpq available in the system path.
       environment.systemPackages = [ pkgs.ntp ];
   
       users.extraUsers = singleton
  
positive.code:         home = stateDir;
        };
  
      jobs.ntpd =
        { description = "NTP Daemon";
  
          wantedBy = [ "multi-user.target" ];
  
          path = [ ntp ];
  
          preStart =
            ''
  
negative.code:   ntpUser = "ntp";
  
    configFile = pkgs.writeText "ntp.conf" ''
      driftfile ${stateDir}/ntp.drift
  
      restrict 127.0.0.1
      restrict -6 ::1
  
      ${toString (map (server: "server " + server + " iburst\n") config.services.ntp.servers)}
    '';
  
    ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup";
  
  in
  
  