/usr/include/directfb/fusion/ is in libdirectfb-dev 1.2.10.0-8+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/directfb/fusion/arena.h
/usr/include/directfb/fusion/build.h
/usr/include/directfb/fusion/call.h
/usr/include/directfb/fusion/conf.h
/usr/include/directfb/fusion/fusion.h
/usr/include/directfb/fusion/fusion_internal.h
/usr/include/directfb/fusion/hash.h
/usr/include/directfb/fusion/lock.h
/usr/include/directfb/fusion/object.h
/usr/include/directfb/fusion/property.h
/usr/include/directfb/fusion/protocol.h
/usr/include/directfb/fusion/reactor.h
/usr/include/directfb/fusion/ref.h
/usr/include/directfb/fusion/shm/
/usr/include/directfb/fusion/shm/pool.h
/usr/include/directfb/fusion/shm/shm.h
/usr/include/directfb/fusion/shm/shm_internal.h
/usr/include/directfb/fusion/shmalloc.h
/usr/include/directfb/fusion/types.h
/usr/include/directfb/fusion/vector.h