次のメッセージが表示される qwt-6.0.1> mingw32-make qwt_clipper.cpp: In instantiation of 'Polygon QwtPolygonClipper<Polygon, Rect, Point, T>::clipPolygon(const Polygon&, bool) const [with Polygon = QPolygon; Rect = QRect; Point = QPoint; T = int]': qwt_clipper.cpp:</polygon,>…