anchor.diff:                     config.services.dnsmasq.resolveLocalQueries;
     hasLocalResolver = config.services.bind.enable || dnsmasqResolve;
   
  -  resolvconfOptions =
  -    builtins.replaceStrings ["\n"] [" "]
  -      (cfg.resolvconfOptions +
  -      (optionalString cfg.dnsSingleRequest " single-request") +
  -      (optionalString cfg.dnsExtensionMechanism " ends0"));
  +  resolvconfOptions = cfg.resolvconfOptions
  +    ++ optional cfg.dnsSingleRequest "single-request"
  +    ++ optional cfg.dnsExtensionMechanism "ends0";
   in
   
   {
  
positive.code:     };
  
      networking.resolvconfOptions = lib.mkOption {
        type = types.lines;
        default = "";
        example = "ndots:1 rotate";
        description = ''
          Set the options in <filename>/etc/resolv.conf</filename>.
        '';
  
negative.code:               # Invalidate the nscd cache whenever resolv.conf is
                # regenerated.
                libc_restart='${pkgs.systemd}/bin/systemctl try-restart --no-block nscd.service 2> /dev/null'
              '' + optionalString (length resolvconfOptions > 0) ''
                # Options as described in resolv.conf(5)
                resolv_conf_options='${concatStringsSep " " resolvconfOptions}'
              '' + optionalString hasLocalResolver ''
                # This hosts runs a full-blown DNS resolver.
                name_servers='127.0.0.1'
  