message: Handle QGLViewer >= 2.7.0
diff: @@ -31,7 +31,11 @@ void Viewer::set_bounding_box(const Point_3 & lower_left, const Point_3 & upper_
  }
  void Viewer::update_GL() {
  +#if QGLVIEWER_VERSION >= 0x020700
  + this->update();
  +#else
  this->updateGL();
  +#endif
  }
  void Viewer::init_scene() {
  