Seems to be a duplicate topic: Missing uievent.c
ui_events.c is not generated when not needed, maybe in your case it would be needed, that’s why the compilation error. A bit more details would probably tell us the exact cause.
It didn’t cause a compilation error for us when it’s in CMakeLists.txt but not present as a file, but anyway, we’ll check this out for a resolution. Thanks for the feedback.