/usr/include/osmium/ is in libosmium-dev 0.0~20111213-g7f3500a-1build2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/osmium/CGAlgorithms.h
/usr/include/osmium/HandlerJavascript.hpp
/usr/include/osmium/exceptions.hpp
/usr/include/osmium/export/
/usr/include/osmium/export.hpp
/usr/include/osmium/export/csv.hpp
/usr/include/osmium/export/shapefile.hpp
/usr/include/osmium/geometry/
/usr/include/osmium/geometry.hpp
/usr/include/osmium/geometry/from_way.hpp
/usr/include/osmium/geometry/linestring.hpp
/usr/include/osmium/geometry/multipolygon.hpp
/usr/include/osmium/geometry/null.hpp
/usr/include/osmium/geometry/point.hpp
/usr/include/osmium/geometry/polygon.hpp
/usr/include/osmium/handler/
/usr/include/osmium/handler.hpp
/usr/include/osmium/handler/coordinates_for_ways.hpp
/usr/include/osmium/handler/debug.hpp
/usr/include/osmium/handler/endtime.hpp
/usr/include/osmium/handler/find_bbox.hpp
/usr/include/osmium/handler/multipolygon.hpp
/usr/include/osmium/handler/progress.hpp
/usr/include/osmium/handler/range_from_history.hpp
/usr/include/osmium/handler/statistics.hpp
/usr/include/osmium/input/
/usr/include/osmium/input.hpp
/usr/include/osmium/input/pbf.hpp
/usr/include/osmium/input/xml.hpp
/usr/include/osmium/javascript/
/usr/include/osmium/javascript/template.hpp
/usr/include/osmium/osm/
/usr/include/osmium/osm.hpp
/usr/include/osmium/osm/area.hpp
/usr/include/osmium/osm/bounds.hpp
/usr/include/osmium/osm/meta.hpp
/usr/include/osmium/osm/node.hpp
/usr/include/osmium/osm/object.hpp
/usr/include/osmium/osm/position.hpp
/usr/include/osmium/osm/relation.hpp
/usr/include/osmium/osm/relation_member.hpp
/usr/include/osmium/osm/relation_member_list.hpp
/usr/include/osmium/osm/tag.hpp
/usr/include/osmium/osm/tag_list.hpp
/usr/include/osmium/osm/types.hpp
/usr/include/osmium/osm/way.hpp
/usr/include/osmium/osm/way_node.hpp
/usr/include/osmium/osm/way_node_list.hpp
/usr/include/osmium/osmfile.hpp
/usr/include/osmium/osmfile_impl.hpp
/usr/include/osmium/output/
/usr/include/osmium/output.hpp
/usr/include/osmium/output/pbf.hpp
/usr/include/osmium/output/xml.hpp
/usr/include/osmium/storage/
/usr/include/osmium/storage/byid.hpp
/usr/include/osmium/storage/objectstore.hpp
/usr/include/osmium/utils/
/usr/include/osmium/utils/delta.hpp
/usr/include/osmium/utils/sqlite.hpp
/usr/include/osmium/utils/stringtable.hpp
/usr/include/osmium/utils/timer.h
/usr/include/osmium/utils/timestamp.hpp
/usr/include/osmium/utils/unicode.hpp