anchor.diff:    config = mkIf cfg.enable {
   
       networking.firewall = mkIf cfg.openFirewall {
  -      allowedTCPPorts = [ cfg.port ];
  +      allowedTCPPorts = [ cfg.confOptions.port ];
       };
   
       systemd.services.znc = {
  
positive.code:           '';
          };
  
          openFirewall = mkOption {
            type = types.bool;
            default = false;
            description = ''
              Whether to open ports in the firewall for ZNC.
            '';
          };
  
          passBlock = mkOption {
            example = defaultPassBlock;
            type = types.string;
  
negative.code:         '';
        };
  
        openFirewall = mkOption {
          type = types.bool;
          default = false;
          description = ''
            Whether to open ports in the firewall for ZNC.
          '';
        };
  
        zncConf = mkOption {
          default = "";
          example = "See: http://wiki.znc.in/Configuration";
  