/usr/include/boost/format/ is in libboost1.62-dev 1.62.0+dfsg-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/format/alt_sstream.hpp
/usr/include/boost/format/alt_sstream_impl.hpp
/usr/include/boost/format/detail/
/usr/include/boost/format/detail/compat_workarounds.hpp
/usr/include/boost/format/detail/config_macros.hpp
/usr/include/boost/format/detail/msvc_disambiguater.hpp
/usr/include/boost/format/detail/unset_macros.hpp
/usr/include/boost/format/detail/workarounds_gcc-2_95.hpp
/usr/include/boost/format/detail/workarounds_stlport.hpp
/usr/include/boost/format/exceptions.hpp
/usr/include/boost/format/feed_args.hpp
/usr/include/boost/format/format_class.hpp
/usr/include/boost/format/format_fwd.hpp
/usr/include/boost/format/format_implementation.hpp
/usr/include/boost/format/free_funcs.hpp
/usr/include/boost/format/group.hpp
/usr/include/boost/format/internals.hpp
/usr/include/boost/format/internals_fwd.hpp
/usr/include/boost/format/parsing.hpp