619d0ec5c3
kcms/touchpad/CMakeLists.txt:18 carries the identical FATAL_ERROR to kcms/mouse, on the same missing xorg-libinput (the X SERVER input driver, not portable to a system with no X server). Disabled pre-emptively rather than after another ~15-minute cycle rediscovers it. Both KCMs keep their KWin+Wayland backends -- BUILD_KCM_MOUSE_KWIN_WAYLAND and BUILD_KCM_TOUCHPAD_KWIN_WAYLAND remain ON -- so neither module is lost, only its unusable X11-session path.