Problem solved. Forgot to create derived class destructor
(Missing {}, see below).
Angus

#include "FormBase.h"

class FormCredits : public FormBase {
public:
        FormCredits(LyXFunc * c, Dialogs * d, Signal0<void> & signal)
          : FormBase( c, d, signal ) {}

        ~FormCredits() {};

private:
        void build();
};

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