/usr/include/libmowgli/ is in libmowgli-dev 1.0.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libmowgli/mowgli.h
/usr/include/libmowgli/mowgli_alloc.h
/usr/include/libmowgli/mowgli_allocation_policy.h
/usr/include/libmowgli/mowgli_allocator.h
/usr/include/libmowgli/mowgli_argstack.h
/usr/include/libmowgli/mowgli_assert.h
/usr/include/libmowgli/mowgli_bitvector.h
/usr/include/libmowgli/mowgli_dictionary.h
/usr/include/libmowgli/mowgli_error_backtrace.h
/usr/include/libmowgli/mowgli_exception.h
/usr/include/libmowgli/mowgli_formatter.h
/usr/include/libmowgli/mowgli_global_storage.h
/usr/include/libmowgli/mowgli_hash.h
/usr/include/libmowgli/mowgli_heap.h
/usr/include/libmowgli/mowgli_hook.h
/usr/include/libmowgli/mowgli_index.h
/usr/include/libmowgli/mowgli_init.h
/usr/include/libmowgli/mowgli_ioevent.h
/usr/include/libmowgli/mowgli_iterator.h
/usr/include/libmowgli/mowgli_list.h
/usr/include/libmowgli/mowgli_logger.h
/usr/include/libmowgli/mowgli_mempool.h
/usr/include/libmowgli/mowgli_module.h
/usr/include/libmowgli/mowgli_object.h
/usr/include/libmowgli/mowgli_object_class.h
/usr/include/libmowgli/mowgli_object_messaging.h
/usr/include/libmowgli/mowgli_object_metadata.h
/usr/include/libmowgli/mowgli_patricia.h
/usr/include/libmowgli/mowgli_queue.h
/usr/include/libmowgli/mowgli_random.h
/usr/include/libmowgli/mowgli_signal.h
/usr/include/libmowgli/mowgli_spinlock.h
/usr/include/libmowgli/mowgli_stdinc.h
/usr/include/libmowgli/mowgli_string.h