/usr/include/boost/poly_collection/ is in libboost1.65-dev 1.65.1+dfsg-0ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/poly_collection/algorithm.hpp
/usr/include/boost/poly_collection/any_collection.hpp
/usr/include/boost/poly_collection/any_collection_fwd.hpp
/usr/include/boost/poly_collection/base_collection.hpp
/usr/include/boost/poly_collection/base_collection_fwd.hpp
/usr/include/boost/poly_collection/detail/
/usr/include/boost/poly_collection/detail/any_iterator.hpp
/usr/include/boost/poly_collection/detail/any_model.hpp
/usr/include/boost/poly_collection/detail/auto_iterator.hpp
/usr/include/boost/poly_collection/detail/base_model.hpp
/usr/include/boost/poly_collection/detail/callable_wrapper.hpp
/usr/include/boost/poly_collection/detail/callable_wrapper_iterator.hpp
/usr/include/boost/poly_collection/detail/function_model.hpp
/usr/include/boost/poly_collection/detail/functional.hpp
/usr/include/boost/poly_collection/detail/integer_sequence.hpp
/usr/include/boost/poly_collection/detail/is_acceptable.hpp
/usr/include/boost/poly_collection/detail/is_constructible.hpp
/usr/include/boost/poly_collection/detail/is_equality_comparable.hpp
/usr/include/boost/poly_collection/detail/is_final.hpp
/usr/include/boost/poly_collection/detail/is_invocable.hpp
/usr/include/boost/poly_collection/detail/is_likely_stateless_lambda.hpp
/usr/include/boost/poly_collection/detail/is_nothrow_eq_comparable.hpp
/usr/include/boost/poly_collection/detail/iterator_impl.hpp
/usr/include/boost/poly_collection/detail/iterator_traits.hpp
/usr/include/boost/poly_collection/detail/newdelete_allocator.hpp
/usr/include/boost/poly_collection/detail/packed_segment.hpp
/usr/include/boost/poly_collection/detail/poly_collection.hpp
/usr/include/boost/poly_collection/detail/segment.hpp
/usr/include/boost/poly_collection/detail/segment_backend.hpp
/usr/include/boost/poly_collection/detail/segment_split.hpp
/usr/include/boost/poly_collection/detail/split_segment.hpp
/usr/include/boost/poly_collection/detail/stride_iterator.hpp
/usr/include/boost/poly_collection/detail/type_info_map.hpp
/usr/include/boost/poly_collection/detail/type_restitution.hpp
/usr/include/boost/poly_collection/detail/value_holder.hpp
/usr/include/boost/poly_collection/exception.hpp
/usr/include/boost/poly_collection/function_collection.hpp
/usr/include/boost/poly_collection/function_collection_fwd.hpp