/usr/include/boost/smart_ptr/detail/ is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/smart_ptr/detail/allocate_array_helper.hpp
/usr/include/boost/smart_ptr/detail/array_deleter.hpp
/usr/include/boost/smart_ptr/detail/array_traits.hpp
/usr/include/boost/smart_ptr/detail/array_utility.hpp
/usr/include/boost/smart_ptr/detail/atomic_count.hpp
/usr/include/boost/smart_ptr/detail/atomic_count_gcc.hpp
/usr/include/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp
/usr/include/boost/smart_ptr/detail/atomic_count_pthreads.hpp
/usr/include/boost/smart_ptr/detail/atomic_count_solaris.hpp
/usr/include/boost/smart_ptr/detail/atomic_count_sync.hpp
/usr/include/boost/smart_ptr/detail/atomic_count_win32.hpp
/usr/include/boost/smart_ptr/detail/lightweight_mutex.hpp
/usr/include/boost/smart_ptr/detail/lwm_nop.hpp
/usr/include/boost/smart_ptr/detail/lwm_pthreads.hpp
/usr/include/boost/smart_ptr/detail/lwm_win32_cs.hpp
/usr/include/boost/smart_ptr/detail/make_array_helper.hpp
/usr/include/boost/smart_ptr/detail/operator_bool.hpp
/usr/include/boost/smart_ptr/detail/quick_allocator.hpp
/usr/include/boost/smart_ptr/detail/shared_array_nmt.hpp
/usr/include/boost/smart_ptr/detail/shared_count.hpp
/usr/include/boost/smart_ptr/detail/shared_ptr_nmt.hpp
/usr/include/boost/smart_ptr/detail/sp_convertible.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_acc_ia64.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_aix.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_cw_x86.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_ia64.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_nt.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_pt.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_snc_ps3.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_solaris.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_spin.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_sync.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_base_w32.hpp
/usr/include/boost/smart_ptr/detail/sp_counted_impl.hpp
/usr/include/boost/smart_ptr/detail/sp_forward.hpp
/usr/include/boost/smart_ptr/detail/sp_has_sync.hpp
/usr/include/boost/smart_ptr/detail/sp_if_array.hpp
/usr/include/boost/smart_ptr/detail/sp_nullptr_t.hpp
/usr/include/boost/smart_ptr/detail/spinlock.hpp
/usr/include/boost/smart_ptr/detail/spinlock_gcc_arm.hpp
/usr/include/boost/smart_ptr/detail/spinlock_nt.hpp
/usr/include/boost/smart_ptr/detail/spinlock_pool.hpp
/usr/include/boost/smart_ptr/detail/spinlock_pt.hpp
/usr/include/boost/smart_ptr/detail/spinlock_sync.hpp
/usr/include/boost/smart_ptr/detail/spinlock_w32.hpp
/usr/include/boost/smart_ptr/detail/yield_k.hpp