/usr/lib/ is in libfcitx-qt5-dev 1.1.1-1build3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5DBusAddons/
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5DBusAddons/FcitxQt5DBusAddonsConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5DBusAddons/FcitxQt5DBusAddonsConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5DBusAddons/FcitxQt5DBusAddonsTargets-none.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5DBusAddons/FcitxQt5DBusAddonsTargets.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5WidgetsAddons/
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5WidgetsAddons/FcitxQt5WidgetsAddonsConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5WidgetsAddons/FcitxQt5WidgetsAddonsConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5WidgetsAddons/FcitxQt5WidgetsAddonsTargets-none.cmake
/usr/lib/x86_64-linux-gnu/cmake/FcitxQt5WidgetsAddons/FcitxQt5WidgetsAddonsTargets.cmake
/usr/lib/x86_64-linux-gnu/libFcitxQt5DBusAddons.so
/usr/lib/x86_64-linux-gnu/libFcitxQt5WidgetsAddons.so