/usr/include/kml/engine/ is in libkml-dev 1.3.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/kml/engine/bbox.h
/usr/include/kml/engine/clone.h
/usr/include/kml/engine/engine_types.h
/usr/include/kml/engine/entity_mapper.h
/usr/include/kml/engine/feature_balloon.h
/usr/include/kml/engine/feature_view.h
/usr/include/kml/engine/feature_visitor.h
/usr/include/kml/engine/find.h
/usr/include/kml/engine/find_xml_namespaces.h
/usr/include/kml/engine/get_link_parents.h
/usr/include/kml/engine/get_links.h
/usr/include/kml/engine/href.h
/usr/include/kml/engine/id_mapper.h
/usr/include/kml/engine/kml_cache.h
/usr/include/kml/engine/kml_file.h
/usr/include/kml/engine/kml_stream.h
/usr/include/kml/engine/kml_uri.h
/usr/include/kml/engine/kmz_cache.h
/usr/include/kml/engine/kmz_file.h
/usr/include/kml/engine/link_util.h
/usr/include/kml/engine/location_util.h
/usr/include/kml/engine/merge.h
/usr/include/kml/engine/object_id_parser_observer.h
/usr/include/kml/engine/old_schema_parser_observer.h
/usr/include/kml/engine/parse_old_schema.h
/usr/include/kml/engine/schema_parser_observer.h
/usr/include/kml/engine/shared_style_parser_observer.h
/usr/include/kml/engine/style_inliner.h
/usr/include/kml/engine/style_merger.h
/usr/include/kml/engine/style_resolver.h
/usr/include/kml/engine/style_splitter.h
/usr/include/kml/engine/update.h