anchor.diff:        };
   
       networking.interfaces.vboxnet0.ip4 = [ { address = "192.168.56.1"; prefixLength = 24; } ];
  -  };
  +  })]);
   }
  
positive.code:     };
    };
  
    config = mkIf config.services.virtualboxHost.enable {
      boot.kernelModules = [ "vboxdrv" "vboxnetadp" "vboxnetflt" ];
      boot.extraModulePackages = [ virtualbox ];
      environment.systemPackages = [ virtualbox ];
  
negative.code:       '';
  
      # Since we lack the right setuid binaries, set up a host-only network by default.
    } (mkIf config.services.virtualboxHost.addNetworkInterface {
      systemd.services."vboxnet0" =
        { description = "VirtualBox vboxnet0 Interface";
          requires = [ "dev-vboxnetctl.device" ];
  