/usr/include/boost/atomic/ is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/atomic/atomic.hpp
/usr/include/boost/atomic/detail/
/usr/include/boost/atomic/detail/base.hpp
/usr/include/boost/atomic/detail/cas128strong.hpp
/usr/include/boost/atomic/detail/cas32strong.hpp
/usr/include/boost/atomic/detail/cas32weak.hpp
/usr/include/boost/atomic/detail/cas64strong-ptr.hpp
/usr/include/boost/atomic/detail/cas64strong.hpp
/usr/include/boost/atomic/detail/config.hpp
/usr/include/boost/atomic/detail/gcc-alpha.hpp
/usr/include/boost/atomic/detail/gcc-armv6plus.hpp
/usr/include/boost/atomic/detail/gcc-atomic.hpp
/usr/include/boost/atomic/detail/gcc-cas.hpp
/usr/include/boost/atomic/detail/gcc-ppc.hpp
/usr/include/boost/atomic/detail/gcc-sparcv9.hpp
/usr/include/boost/atomic/detail/gcc-x86.hpp
/usr/include/boost/atomic/detail/generic-cas.hpp
/usr/include/boost/atomic/detail/interlocked.hpp
/usr/include/boost/atomic/detail/link.hpp
/usr/include/boost/atomic/detail/linux-arm.hpp
/usr/include/boost/atomic/detail/lockpool.hpp
/usr/include/boost/atomic/detail/platform.hpp
/usr/include/boost/atomic/detail/type-classification.hpp
/usr/include/boost/atomic/detail/windows.hpp