try object

src/mvvmcore/binding.cpp

@@ -159,7 +159,6 @@ void BindingPrivate::bindTo(QMetaMethod changeSignal)
 		testNotifier(viewProperty, true);
 		changeSignal = viewProperty.notifySignal();
 	}
-	auto signal = viewProperty.notifySignal();
 	auto trigger = metaObject()->method(metaObject()->indexOfSlot("viewTrigger()"));
 	connect(view, changeSignal, this, trigger);
 }

src/mvvmcore/binding.h

@@ -32,7 +32,7 @@ public:
 	bool isValid() const;
 
 private:
-	QPointer<BindingPrivate> d;
+	QPointer<QObject> d;
 };
 
 Q_MVVMCORE_EXPORT Binding bind(QObject *viewModel, const char *viewModelProperty,