/usr/include/boost/bimap/detail/ is in libboost1.65-dev 1.65.1+dfsg-0ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/bimap/detail/bimap_core.hpp
/usr/include/boost/bimap/detail/concept_tags.hpp
/usr/include/boost/bimap/detail/debug/
/usr/include/boost/bimap/detail/debug/static_error.hpp
/usr/include/boost/bimap/detail/generate_index_binder.hpp
/usr/include/boost/bimap/detail/generate_relation_binder.hpp
/usr/include/boost/bimap/detail/generate_view_binder.hpp
/usr/include/boost/bimap/detail/is_set_type_of.hpp
/usr/include/boost/bimap/detail/manage_additional_parameters.hpp
/usr/include/boost/bimap/detail/manage_bimap_key.hpp
/usr/include/boost/bimap/detail/map_view_base.hpp
/usr/include/boost/bimap/detail/map_view_iterator.hpp
/usr/include/boost/bimap/detail/modifier_adaptor.hpp
/usr/include/boost/bimap/detail/non_unique_views_helper.hpp
/usr/include/boost/bimap/detail/set_view_base.hpp
/usr/include/boost/bimap/detail/set_view_iterator.hpp
/usr/include/boost/bimap/detail/test/
/usr/include/boost/bimap/detail/test/check_metadata.hpp
/usr/include/boost/bimap/detail/user_interface_config.hpp