/usr/include/kml/convenience/ is in libkml-dev 1.3.0~r864+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/kml/convenience/atom_util.h
/usr/include/kml/convenience/convenience.h
/usr/include/kml/convenience/csv_file.h
/usr/include/kml/convenience/csv_parser.h
/usr/include/kml/convenience/element_counter.h
/usr/include/kml/convenience/feature_list.h
/usr/include/kml/convenience/google_doc_list.h
/usr/include/kml/convenience/google_maps_data.h
/usr/include/kml/convenience/google_picasa_web.h
/usr/include/kml/convenience/google_spreadsheets.h
/usr/include/kml/convenience/gpx_trk_pt_handler.h
/usr/include/kml/convenience/http_client.h
/usr/include/kml/convenience/kml_feature_list_saver.h
/usr/include/kml/convenience/kmz_check_links.h