Qt5 5.15.5. I'm unfortunately not very familiar with Qt5, but from this doc: https://doc-snapshots.qt.io/qt5-5.15/functions.html we can see that there are two 'grabFrameBuffer' methods with a different case on 'B': grabFrameBuffer: QGLWidget grabFramebuffer: QOpenGLWidget (yes, talk about consistency...)
Qt5 5.15.5.
libscidavis doesn't build with QT5