Simple demo won't link - undef vtable and Q_OBJECT

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You didn't declare your signals or one of your slots. You have to declare your signals and slots.
you need something like:

signals:
  void quit_button_clicked();
  void print_button_clicked();
 
public slots:
	void printmyplot();
            void quit_button_clicked();

signals:
  void quit_button_clicked();
  void print_button_clicked();

public slots:
	void printmyplot();
            void quit_button_clicked();

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