/usr/include/infiniband/complib/ is in libopensm-dev 3.3.20-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/infiniband/complib/cl_atomic.h
/usr/include/infiniband/complib/cl_atomic_osd.h
/usr/include/infiniband/complib/cl_byteswap.h
/usr/include/infiniband/complib/cl_byteswap_osd.h
/usr/include/infiniband/complib/cl_comppool.h
/usr/include/infiniband/complib/cl_debug.h
/usr/include/infiniband/complib/cl_debug_osd.h
/usr/include/infiniband/complib/cl_dispatcher.h
/usr/include/infiniband/complib/cl_event.h
/usr/include/infiniband/complib/cl_event_osd.h
/usr/include/infiniband/complib/cl_event_wheel.h
/usr/include/infiniband/complib/cl_fleximap.h
/usr/include/infiniband/complib/cl_list.h
/usr/include/infiniband/complib/cl_log.h
/usr/include/infiniband/complib/cl_map.h
/usr/include/infiniband/complib/cl_math.h
/usr/include/infiniband/complib/cl_nodenamemap.h
/usr/include/infiniband/complib/cl_packoff.h
/usr/include/infiniband/complib/cl_packon.h
/usr/include/infiniband/complib/cl_passivelock.h
/usr/include/infiniband/complib/cl_pool.h
/usr/include/infiniband/complib/cl_ptr_vector.h
/usr/include/infiniband/complib/cl_qcomppool.h
/usr/include/infiniband/complib/cl_qlist.h
/usr/include/infiniband/complib/cl_qmap.h
/usr/include/infiniband/complib/cl_qpool.h
/usr/include/infiniband/complib/cl_spinlock.h
/usr/include/infiniband/complib/cl_spinlock_osd.h
/usr/include/infiniband/complib/cl_thread.h
/usr/include/infiniband/complib/cl_thread_osd.h
/usr/include/infiniband/complib/cl_threadpool.h
/usr/include/infiniband/complib/cl_timer.h
/usr/include/infiniband/complib/cl_timer_osd.h
/usr/include/infiniband/complib/cl_types.h
/usr/include/infiniband/complib/cl_types_osd.h
/usr/include/infiniband/complib/cl_vector.h