/usr/include/libcwiimote/ is in libcwiimote-dev 0.4+svn83ant-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libcwiimote/bthid.h
/usr/include/libcwiimote/wiimote.h
/usr/include/libcwiimote/wiimote_api.h
/usr/include/libcwiimote/wiimote_classic.h
/usr/include/libcwiimote/wiimote_error.h
/usr/include/libcwiimote/wiimote_event.h
/usr/include/libcwiimote/wiimote_io.h
/usr/include/libcwiimote/wiimote_ir.h
/usr/include/libcwiimote/wiimote_link.h
/usr/include/libcwiimote/wiimote_mii.h
/usr/include/libcwiimote/wiimote_nunchuk.h
/usr/include/libcwiimote/wiimote_report.h
/usr/include/libcwiimote/wiimote_speaker.h
/usr/include/libcwiimote/wiimote_util.h