Wrong syntax for the connect() statement. Should be:
connect(d_knob, SIGNAL(sliderMoved(double)), this, SLOT(testQwtDialSliderMoved(double)));
connect(d_knob, SIGNAL(sliderMoved(double)), this, SLOT(testQwtDialSliderMoved(double)));
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and be sure to define "testQwtDialSliderMoved()" as a slot in your MainWindow class.
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