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QQmlComponent: Component is not ready

When building VTK in Linux using Qt5.15.1 I see the above error. It has been happening over the past month or so. VTK is being built with GROUP_ENABLE_Qt: WANT. Strangely under Windows everything builds Ok. I have deleted VTK/lib/qml and re-run CMake.

Linux

Under Linux, VTK/lib/qml/VTK.9.0 contains the following files:

libqmlvtkplugind.so  qmldir

This is the full error message:

27/1576] Linking CXX shared module lib/qml/VTK.9.0/libqmlvtkplugind.so
FAILED: lib/qml/VTK.9.0/libqmlvtkplugind.so lib/qml/VTK.9.0/plugins.qmltypes 
: && /usr/bin/c++ -fPIC -g  -Wl,-lc  -Wl,-lc -shared  -o lib/qml/VTK.9.0/libqmlvtkplugind.so GUISupport/QtQuick/qml/CMakeFiles/qmlvtkplugin.dir/qmlvtkplugin_autogen/mocs_compilation.cpp.o GUISupport/QtQuick/qml/CMakeFiles/qmlvtkplugin.dir/QQmlVTKPlugin.cxx.o  -Wl,-rpath,/home/amaclean/Development/Kitware/build/VTK/lib:/home/amaclean/Qt/5.15.1/gcc_64/lib:  lib/libvtkGUISupportQtQuick-9.0.so.9.0.0  lib/libvtkGUISupportQt-9.0.so.9.0.0  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5OpenGL.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Widgets.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Gui.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Core.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5OpenGL.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Widgets.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Quick.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Gui.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5QmlModels.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Qml.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Network.so.5.15.1  /home/amaclean/Qt/5.15.1/gcc_64/lib/libQt5Core.so.5.15.1  lib/libvtkRenderingOpenGL2-9.0.so.9.0.0  lib/libvtkRenderingUI-9.0.so.9.0.0  /usr/lib/x86_64-linux-gnu/libX11.so  lib/libvtkglew-9.0.so.9.0.0  /usr/lib/x86_64-linux-gnu/libGLX.so  /usr/lib/x86_64-linux-gnu/libOpenGL.so  /usr/lib/x86_64-linux-gnu/libX11.so  lib/libvtkInteractionWidgets-9.0.so.9.0.0  lib/libvtkRenderingContext2D-9.0.so.9.0.0  lib/libvtkRenderingCore-9.0.so.9.0.0  lib/libvtkFiltersSources-9.0.so.9.0.0  lib/libvtkFiltersGeneral-9.0.so.9.0.0  lib/libvtkFiltersCore-9.0.so.9.0.0  lib/libvtkCommonExecutionModel-9.0.so.9.0.0  lib/libvtkCommonDataModel-9.0.so.9.0.0  lib/libvtkCommonTransforms-9.0.so.9.0.0  lib/libvtkCommonMisc-9.0.so.9.0.0  lib/libvtkCommonMath-9.0.so.9.0.0  lib/libvtkCommonCore-9.0.so.9.0.0  lib/libvtkkissfft-9.0.so.9.0.0  lib/libvtksys-9.0.so.9.0.0  -ldl  -lpthread  /usr/lib/x86_64-linux-gnu/libtbb.so.2  -Wl,-rpath-link,/home/amaclean/Development/Kitware/build/VTK/lib && cd /home/amaclean/Development/Kitware/build/VTK/GUISupport/QtQuick/qml && /home/amaclean/Qt/5.15.1/gcc_64/bin/qmlplugindump -output /home/amaclean/Development/Kitware/build/VTK/lib/qml/VTK.9.0/plugins.qmltypes VTK 9.0 /home/amaclean/Development/Kitware/build/VTK/lib/qml
QQmlComponent: Component is not ready

Windows

For comparison under Windows everything builds Ok with a warning message during configuration:

CMake Warning at GUISupport/QtQuick/qml/CMakeLists.txt:103 (message):
  Qt5 is configured in both Debug and Release modes.  Due to Qt issue 47774
  (https://bugreports.qt.io/browse/QTBUG-47774), skipping generation of
  qmltypes file.  Using the one provided with the source tree instead.

Under Windows, VTK/lib/qml/VTK.9.0 contains the following files:

plugins.qmltypes  qmlvtkplugind.dll*  qmlvtkplugind.pdb
qmldir            qmlvtkplugind.ilk