anchor.diff:      };
     };
   
  -  config = mkIf config.services.virtualboxHost.enable {
  +  config = mkIf config.services.virtualboxHost.enable (mkMerge [{
       boot.kernelModules = [ "vboxdrv" "vboxnetadp" "vboxnetflt" ];
       boot.extraModulePackages = [ virtualbox ];
       environment.systemPackages = [ virtualbox ];
  
positive.code:       };
  
      networking.interfaces.vboxnet0.ip4 = [ { address = "192.168.56.1"; prefixLength = 24; } ];
    };
  }
  
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" ];
  