Qt6WaylandCompositor could not be found because dependency Wayland could not be found

・Custom Shell
https://doc.qt.io/qt-6/qtwaylandcompositor-custom-shell-example.html

・Minimal CPP
https://doc.qt.io/qt-6/qtwaylandcompositor-minimal-cpp-example.html

tested these two demos on Ubuntu 22.04LTS, got the cmake error on finding 

Qt6WaylandCompositor could not be found because dependency Wayland could not be found

fixed by installing wayland dependence

sudo apt install libwayland-dev

I cannot see this mentioned in the document.