/usr/include/boost/numeric/interval/detail/ is in libboost1.54-dev 1.54.0-4ubuntu3.
This file is owned by root:root, with mode 0o755.
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/usr/include/boost/numeric/interval/detail/alpha_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/bcc_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/bugs.hpp
/usr/include/boost/numeric/interval/detail/c99_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/c99sub_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/division.hpp
/usr/include/boost/numeric/interval/detail/ia64_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/interval_prototype.hpp
/usr/include/boost/numeric/interval/detail/msvc_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/ppc_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/sparc_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/test_input.hpp
/usr/include/boost/numeric/interval/detail/x86_rounding_control.hpp
/usr/include/boost/numeric/interval/detail/x86gcc_rounding_control.hpp