- connect(&mapper_, SIGNAL(mapped(QObject*)),
- this, SLOT(on_action(QObject*)));
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+ connect(&mapper_, SIGNAL(mappedObject(QObject*)), this, SLOT(on_action(QObject*)));
+#else
+ connect(&mapper_, SIGNAL(mapped(QObject*)), this, SLOT(on_action(QObject*)));
+#endif