Vtk9 fails to build when some other (unknown) package is installed: QQMLComponent: Component is not ready
Error:
FAILED: /lib/qml/VTK.9.2/libqmlvtkplugin.so lib/qml/VTK.9.2/plugins.qmltypes /usr/ports/math/vtk9/work/.build/lib/qml/VTK.9.2/plugins.qmltypes
QQMLComponent: Component is not ready
This error occurs on FreeBSD only when some unrelated, unknown package is installed.
Please see the downstream bug report.