For the following slots, I get "you forgot the Q_OBJECT macro" warning and the slots and signals are underlined.

signals:
void start();
void reset();
void pause();
void changeDirection(Counter::CountDirection);
void setDuration(QTime);

and the slots:

protected slots:
void sendStartSignal();
void sendResetSignal();
void sendPauseSignal();
void sendChangeDirectionSignal(Counter::CountDirection);
void sendSetDuration(QTime);

However, I've declared Q_OBJECT above.