anchor.diff:  let
   
     nssModulesPath = config.system.nssModules.path;
  +  cfg = config.services.nscd;
   
     inherit (pkgs.lib) singleton;
   
  
positive.code:         description = "Whether to enable the Name Service Cache Daemon.";
        };
  
      };
  
    };
  
negative.code: 
    ###### implementation
  
    config = mkIf cfg.enable {
  
      users.extraUsers = singleton
        { name = "nscd";
  