/usr/include/boost/units/base_units/us/ is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/units/base_units/us/cup.hpp
/usr/include/boost/units/base_units/us/dram.hpp
/usr/include/boost/units/base_units/us/fluid_dram.hpp
/usr/include/boost/units/base_units/us/fluid_ounce.hpp
/usr/include/boost/units/base_units/us/foot.hpp
/usr/include/boost/units/base_units/us/gallon.hpp
/usr/include/boost/units/base_units/us/gill.hpp
/usr/include/boost/units/base_units/us/grain.hpp
/usr/include/boost/units/base_units/us/hundredweight.hpp
/usr/include/boost/units/base_units/us/inch.hpp
/usr/include/boost/units/base_units/us/mil.hpp
/usr/include/boost/units/base_units/us/mile.hpp
/usr/include/boost/units/base_units/us/minim.hpp
/usr/include/boost/units/base_units/us/ounce.hpp
/usr/include/boost/units/base_units/us/pint.hpp
/usr/include/boost/units/base_units/us/pound.hpp
/usr/include/boost/units/base_units/us/pound_force.hpp
/usr/include/boost/units/base_units/us/quart.hpp
/usr/include/boost/units/base_units/us/tablespoon.hpp
/usr/include/boost/units/base_units/us/teaspoon.hpp
/usr/include/boost/units/base_units/us/ton.hpp
/usr/include/boost/units/base_units/us/yard.hpp