/usr/include/liborcus-0.6/ is in liborcus-dev 0.5.1-7.
This file is owned by root:root, with mode 0o755.
..
/usr/include/liborcus-0.6/orcus/
/usr/include/liborcus-0.6/orcus/base64.hpp
/usr/include/liborcus-0.6/orcus/cell_buffer.hpp
/usr/include/liborcus-0.6/orcus/css_parser.hpp
/usr/include/liborcus-0.6/orcus/csv_parser.hpp
/usr/include/liborcus-0.6/orcus/dom_tree.hpp
/usr/include/liborcus-0.6/orcus/env.hpp
/usr/include/liborcus-0.6/orcus/exception.hpp
/usr/include/liborcus-0.6/orcus/global.hpp
/usr/include/liborcus-0.6/orcus/ooxml/
/usr/include/liborcus-0.6/orcus/ooxml/encryption_info.hpp
/usr/include/liborcus-0.6/orcus/orcus_csv.hpp
/usr/include/liborcus-0.6/orcus/orcus_gnumeric.hpp
/usr/include/liborcus-0.6/orcus/orcus_ods.hpp
/usr/include/liborcus-0.6/orcus/orcus_xlsx.hpp
/usr/include/liborcus-0.6/orcus/orcus_xml.hpp
/usr/include/liborcus-0.6/orcus/pstring.hpp
/usr/include/liborcus-0.6/orcus/sax_ns_parser.hpp
/usr/include/liborcus-0.6/orcus/sax_parser.hpp
/usr/include/liborcus-0.6/orcus/sax_parser_global.hpp
/usr/include/liborcus-0.6/orcus/sax_token_parser.hpp
/usr/include/liborcus-0.6/orcus/spreadsheet/
/usr/include/liborcus-0.6/orcus/spreadsheet/export_interface.hpp
/usr/include/liborcus-0.6/orcus/spreadsheet/import_interface.hpp
/usr/include/liborcus-0.6/orcus/spreadsheet/types.hpp
/usr/include/liborcus-0.6/orcus/stream.hpp
/usr/include/liborcus-0.6/orcus/string_pool.hpp
/usr/include/liborcus-0.6/orcus/tokens.hpp
/usr/include/liborcus-0.6/orcus/types.hpp
/usr/include/liborcus-0.6/orcus/xml_namespace.hpp
/usr/include/liborcus-0.6/orcus/xml_structure_tree.hpp
/usr/include/liborcus-0.6/orcus/zip_archive.hpp
/usr/include/liborcus-0.6/orcus/zip_archive_stream.hpp