[DiapDealer]

I'll take the XKB stuff under advisement, but there are always going to be warnings like this that pop up over time. It's hard to keep up with them. And as already mentioned, there is no actual error being reported when the initial cmake can't find that particular library.

As to your reported missing PyQt5 modules, you must not be running the latest test plugin. Sigil 2.3.1 does not use Qt5 and v20 of the test plugin should be testing for PySide6 modules instead. If you ARE running v20 of the test plugin, then something in Sigil 2.3.0+'s plugin framework must have broken it. But v20 of the test plugin is properly looking for PySide6 modules in my usage.