Fix signature in qt6

src/x11_helper.cpp

@@ -351,7 +351,11 @@ bool XEventNotifier::processXkbEvents(xcb_generic_event_t* event)
     return true;
 }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 bool XEventNotifier::nativeEventFilter(const QByteArray &eventType, void *message, long *)
+#else
+bool XEventNotifier::nativeEventFilter(const QByteArray &eventType, void *message, qintptr *)
+#endif
 {
 //	kDebug() << "event type:" << eventType;
     if (eventType == "xcb_generic_event_t") {

src/x11_helper.h

@@ -104,7 +104,11 @@ protected:
 //    bool x11Event(XEvent * e);
     virtual bool processOtherEvents(xcb_generic_event_t* e);
     virtual bool processXkbEvents(xcb_generic_event_t* e);
-    virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long *) Q_DECL_OVERRIDE;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    bool nativeEventFilter(const QByteArray &eventType, void *message, long *result) override;
+#else
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) override;
+#endif
 
 private:
     int registerForXkbEvents(Display* display);