/usr/include/genometools/extended/ is in libgenometools0-dev 1.5.10+ds-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/genometools/extended/add_introns_stream_api.h
/usr/include/genometools/extended/anno_db_gfflike_api.h
/usr/include/genometools/extended/anno_db_schema_api.h
/usr/include/genometools/extended/array_in_stream_api.h
/usr/include/genometools/extended/array_out_stream_api.h
/usr/include/genometools/extended/bed_in_stream_api.h
/usr/include/genometools/extended/cds_stream_api.h
/usr/include/genometools/extended/check_boundaries_visitor_api.h
/usr/include/genometools/extended/comment_node_api.h
/usr/include/genometools/extended/csa_stream_api.h
/usr/include/genometools/extended/dup_feature_stream_api.h
/usr/include/genometools/extended/eof_node_api.h
/usr/include/genometools/extended/extract_feature_stream_api.h
/usr/include/genometools/extended/feature_in_stream_api.h
/usr/include/genometools/extended/feature_index_api.h
/usr/include/genometools/extended/feature_index_memory_api.h
/usr/include/genometools/extended/feature_node_api.h
/usr/include/genometools/extended/feature_node_iterator_api.h
/usr/include/genometools/extended/feature_out_stream_api.h
/usr/include/genometools/extended/feature_stream_api.h
/usr/include/genometools/extended/genome_node_api.h
/usr/include/genometools/extended/gff3_in_stream_api.h
/usr/include/genometools/extended/gff3_out_stream_api.h
/usr/include/genometools/extended/gff3_parser_api.h
/usr/include/genometools/extended/gff3_visitor_api.h
/usr/include/genometools/extended/gtf_in_stream_api.h
/usr/include/genometools/extended/gtf_out_stream_api.h
/usr/include/genometools/extended/id_to_md5_stream_api.h
/usr/include/genometools/extended/inter_feature_stream_api.h
/usr/include/genometools/extended/match_api.h
/usr/include/genometools/extended/match_blast_api.h
/usr/include/genometools/extended/match_iterator_api.h
/usr/include/genometools/extended/match_last_api.h
/usr/include/genometools/extended/match_open_api.h
/usr/include/genometools/extended/match_sw_api.h
/usr/include/genometools/extended/match_visitor_api.h
/usr/include/genometools/extended/md5_to_id_stream_api.h
/usr/include/genometools/extended/merge_feature_stream_api.h
/usr/include/genometools/extended/merge_stream_api.h
/usr/include/genometools/extended/meta_node_api.h
/usr/include/genometools/extended/node_stream_api.h
/usr/include/genometools/extended/node_visitor_api.h
/usr/include/genometools/extended/orf_iterator_api.h
/usr/include/genometools/extended/rdb_api.h
/usr/include/genometools/extended/rdb_mysql_api.h
/usr/include/genometools/extended/rdb_sqlite_api.h
/usr/include/genometools/extended/rdb_visitor_api.h
/usr/include/genometools/extended/region_mapping_api.h
/usr/include/genometools/extended/region_node_api.h
/usr/include/genometools/extended/reverse_api.h
/usr/include/genometools/extended/script_filter_api.h
/usr/include/genometools/extended/script_wrapper_stream_api.h
/usr/include/genometools/extended/script_wrapper_visitor_api.h
/usr/include/genometools/extended/select_stream_api.h
/usr/include/genometools/extended/sequence_node_api.h
/usr/include/genometools/extended/set_source_visitor_api.h
/usr/include/genometools/extended/sort_stream_api.h
/usr/include/genometools/extended/stat_stream_api.h
/usr/include/genometools/extended/tag_value_map_api.h
/usr/include/genometools/extended/type_checker_api.h
/usr/include/genometools/extended/type_checker_builtin_api.h
/usr/include/genometools/extended/type_checker_obo_api.h
/usr/include/genometools/extended/uniq_stream_api.h
/usr/include/genometools/extended/visitor_stream_api.h
/usr/include/genometools/extended/xrf_checker_api.h