/usr/include/boost/detail/winapi/ is in libboost1.58-dev 1.58.0+dfsg-5ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/detail/winapi/GetCurrentProcess.hpp
/usr/include/boost/detail/winapi/GetCurrentThread.hpp
/usr/include/boost/detail/winapi/GetLastError.hpp
/usr/include/boost/detail/winapi/GetProcessTimes.hpp
/usr/include/boost/detail/winapi/GetThreadTimes.hpp
/usr/include/boost/detail/winapi/LocalFree.hpp
/usr/include/boost/detail/winapi/basic_types.hpp
/usr/include/boost/detail/winapi/config.hpp
/usr/include/boost/detail/winapi/crypt.hpp
/usr/include/boost/detail/winapi/directory_management.hpp
/usr/include/boost/detail/winapi/dll.hpp
/usr/include/boost/detail/winapi/error_handling.hpp
/usr/include/boost/detail/winapi/file_management.hpp
/usr/include/boost/detail/winapi/handles.hpp
/usr/include/boost/detail/winapi/memory.hpp
/usr/include/boost/detail/winapi/process.hpp
/usr/include/boost/detail/winapi/security.hpp
/usr/include/boost/detail/winapi/synchronization.hpp
/usr/include/boost/detail/winapi/system.hpp
/usr/include/boost/detail/winapi/thread.hpp
/usr/include/boost/detail/winapi/thread_pool.hpp
/usr/include/boost/detail/winapi/time.hpp
/usr/include/boost/detail/winapi/timers.hpp
/usr/include/boost/detail/winapi/tls.hpp
/usr/include/boost/detail/winapi/waitable_timer.hpp