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