/usr/include/boost/geometry/multi/ is in libboost1.55-dev 1.55.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/geometry/multi/algorithms/
/usr/include/boost/geometry/multi/algorithms/append.hpp
/usr/include/boost/geometry/multi/algorithms/area.hpp
/usr/include/boost/geometry/multi/algorithms/centroid.hpp
/usr/include/boost/geometry/multi/algorithms/clear.hpp
/usr/include/boost/geometry/multi/algorithms/convert.hpp
/usr/include/boost/geometry/multi/algorithms/correct.hpp
/usr/include/boost/geometry/multi/algorithms/covered_by.hpp
/usr/include/boost/geometry/multi/algorithms/detail/
/usr/include/boost/geometry/multi/algorithms/detail/for_each_range.hpp
/usr/include/boost/geometry/multi/algorithms/detail/modify.hpp
/usr/include/boost/geometry/multi/algorithms/detail/modify_with_predicate.hpp
/usr/include/boost/geometry/multi/algorithms/detail/multi_sum.hpp
/usr/include/boost/geometry/multi/algorithms/detail/overlay/
/usr/include/boost/geometry/multi/algorithms/detail/overlay/copy_segment_point.hpp
/usr/include/boost/geometry/multi/algorithms/detail/overlay/copy_segments.hpp
/usr/include/boost/geometry/multi/algorithms/detail/overlay/get_ring.hpp
/usr/include/boost/geometry/multi/algorithms/detail/overlay/get_turns.hpp
/usr/include/boost/geometry/multi/algorithms/detail/overlay/select_rings.hpp
/usr/include/boost/geometry/multi/algorithms/detail/overlay/self_turn_points.hpp
/usr/include/boost/geometry/multi/algorithms/detail/point_on_border.hpp
/usr/include/boost/geometry/multi/algorithms/detail/sections/
/usr/include/boost/geometry/multi/algorithms/detail/sections/range_by_section.hpp
/usr/include/boost/geometry/multi/algorithms/detail/sections/sectionalize.hpp
/usr/include/boost/geometry/multi/algorithms/disjoint.hpp
/usr/include/boost/geometry/multi/algorithms/distance.hpp
/usr/include/boost/geometry/multi/algorithms/envelope.hpp
/usr/include/boost/geometry/multi/algorithms/equals.hpp
/usr/include/boost/geometry/multi/algorithms/for_each.hpp
/usr/include/boost/geometry/multi/algorithms/intersection.hpp
/usr/include/boost/geometry/multi/algorithms/length.hpp
/usr/include/boost/geometry/multi/algorithms/num_geometries.hpp
/usr/include/boost/geometry/multi/algorithms/num_interior_rings.hpp
/usr/include/boost/geometry/multi/algorithms/num_points.hpp
/usr/include/boost/geometry/multi/algorithms/perimeter.hpp
/usr/include/boost/geometry/multi/algorithms/reverse.hpp
/usr/include/boost/geometry/multi/algorithms/simplify.hpp
/usr/include/boost/geometry/multi/algorithms/transform.hpp
/usr/include/boost/geometry/multi/algorithms/unique.hpp
/usr/include/boost/geometry/multi/algorithms/within.hpp
/usr/include/boost/geometry/multi/core/
/usr/include/boost/geometry/multi/core/closure.hpp
/usr/include/boost/geometry/multi/core/geometry_id.hpp
/usr/include/boost/geometry/multi/core/interior_rings.hpp
/usr/include/boost/geometry/multi/core/is_areal.hpp
/usr/include/boost/geometry/multi/core/point_order.hpp
/usr/include/boost/geometry/multi/core/point_type.hpp
/usr/include/boost/geometry/multi/core/ring_type.hpp
/usr/include/boost/geometry/multi/core/tags.hpp
/usr/include/boost/geometry/multi/core/topological_dimension.hpp
/usr/include/boost/geometry/multi/geometries/
/usr/include/boost/geometry/multi/geometries/concepts/
/usr/include/boost/geometry/multi/geometries/concepts/check.hpp
/usr/include/boost/geometry/multi/geometries/concepts/multi_linestring_concept.hpp
/usr/include/boost/geometry/multi/geometries/concepts/multi_point_concept.hpp
/usr/include/boost/geometry/multi/geometries/concepts/multi_polygon_concept.hpp
/usr/include/boost/geometry/multi/geometries/multi_geometries.hpp
/usr/include/boost/geometry/multi/geometries/multi_linestring.hpp
/usr/include/boost/geometry/multi/geometries/multi_point.hpp
/usr/include/boost/geometry/multi/geometries/multi_polygon.hpp
/usr/include/boost/geometry/multi/geometries/register/
/usr/include/boost/geometry/multi/geometries/register/multi_linestring.hpp
/usr/include/boost/geometry/multi/geometries/register/multi_point.hpp
/usr/include/boost/geometry/multi/geometries/register/multi_polygon.hpp
/usr/include/boost/geometry/multi/io/
/usr/include/boost/geometry/multi/io/dsv/
/usr/include/boost/geometry/multi/io/dsv/write.hpp
/usr/include/boost/geometry/multi/io/wkt/
/usr/include/boost/geometry/multi/io/wkt/detail/
/usr/include/boost/geometry/multi/io/wkt/detail/prefix.hpp
/usr/include/boost/geometry/multi/io/wkt/read.hpp
/usr/include/boost/geometry/multi/io/wkt/wkt.hpp
/usr/include/boost/geometry/multi/io/wkt/write.hpp
/usr/include/boost/geometry/multi/multi.hpp
/usr/include/boost/geometry/multi/strategies/
/usr/include/boost/geometry/multi/strategies/cartesian/
/usr/include/boost/geometry/multi/strategies/cartesian/centroid_average.hpp
/usr/include/boost/geometry/multi/views/
/usr/include/boost/geometry/multi/views/detail/
/usr/include/boost/geometry/multi/views/detail/range_type.hpp