anchor.diff:      # Make chronyc available in the system path
       environment.systemPackages = [ pkgs.chrony ];
   
  +    systemd.services.ntpd.enable = false;
  +
       users.extraUsers = singleton
         { name = chronyUser;
           uid = config.ids.uids.chrony;
  
positive.code: 
          wantedBy = [ "multi-user.target" ];
          after = [ "network.target" ];
  
          path = [ chrony ];
  
  
negative.code:       };
  
        servers = mkOption {
          default = config.services.ntp.servers;
          description = ''
            The set of NTP servers from which to synchronise.
          '';
  