ShaderTools package not found when building qtdeclarative examples in-tree in a prefix build (not as ExternalProjects)

agent:2021/09/10 00:09:50 build.go:391: CMake Warning at /home/qt/work/install/lib/cmake/Qt6/Qt6Config.cmake:176 (find_package):
agent:2021/09/10 00:09:50 build.go:391:   Found package configuration file:
agent:2021/09/10 00:09:50 build.go:391:     /home/qt/work/install/lib/cmake/Qt6ShaderTools/Qt6ShaderToolsConfig.cmake
agent:2021/09/10 00:09:50 build.go:391:   but it set Qt6ShaderTools_FOUND to FALSE so package "Qt6ShaderTools" is
agent:2021/09/10 00:09:50 build.go:391:   considered to be NOT FOUND.  Reason given by package:
agent:2021/09/10 00:09:50 build.go:391:   Target "Qt6::ShaderTools" was not found.  Possibly due to
agent:2021/09/10 00:09:50 build.go:391:   QT_NO_CREATE_TARGETS being set to TRUE and thus
agent:2021/09/10 00:09:50 build.go:391:   /home/qt/work/install/lib/cmake/Qt6ShaderTools/Qt6ShaderToolsTargets.cmake
agent:2021/09/10 00:09:50 build.go:391:   was not included to define the target.
agent:2021/09/10 00:09:50 build.go:391: Call Stack (most recent call first):
agent:2021/09/10 00:09:50 build.go:391:   examples/quick/scenegraph/custommaterial/CMakeLists.txt:22 (find_package)
agent:2021/09/10 00:09:50 build.go:391: CMake Warning at examples/quick/scenegraph/custommaterial/CMakeLists.txt:22 (find_package):
agent:2021/09/10 00:09:50 build.go:391:   Found package configuration file:
agent:2021/09/10 00:09:50 build.go:391:     /home/qt/work/install/lib/cmake/Qt6/Qt6Config.cmake
agent:2021/09/10 00:09:50 build.go:391:   but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
agent:2021/09/10 00:09:50 build.go:391:   FOUND.  Reason given by package:
agent:2021/09/10 00:09:50 build.go:391:   Failed to find Qt component "ShaderTools".
agent:2021/09/10 00:09:50 build.go:391:   Expected Config file at
agent:2021/09/10 00:09:50 build.go:391:   "/home/qt/work/install/lib/cmake/Qt6ShaderTools/Qt6ShaderToolsConfig.cmake"
agent:2021/09/10 00:09:50 build.go:391:   exists