/usr/include/glom-1.30/libglom/data_structure/ is in libglom-1.30-dev 1.30.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/glom-1.30/libglom/data_structure/choicevalue.h
/usr/include/glom-1.30/libglom/data_structure/database_title.h
/usr/include/glom-1.30/libglom/data_structure/field.h
/usr/include/glom-1.30/libglom/data_structure/fieldtypes.h
/usr/include/glom-1.30/libglom/data_structure/foundset.h
/usr/include/glom-1.30/libglom/data_structure/glomconversions.h
/usr/include/glom-1.30/libglom/data_structure/groupinfo.h
/usr/include/glom-1.30/libglom/data_structure/has_title_singular.h
/usr/include/glom-1.30/libglom/data_structure/layout/
/usr/include/glom-1.30/libglom/data_structure/layout/custom_title.h
/usr/include/glom-1.30/libglom/data_structure/layout/formatting.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutgroup.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_button.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_calendarportal.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_field.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_image.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_line.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_notebook.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_placeholder.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_portal.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_text.h
/usr/include/glom-1.30/libglom/data_structure/layout/layoutitem_withformatting.h
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/layoutitem_fieldsummary.h
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/layoutitem_footer.h
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/layoutitem_groupby.h
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/layoutitem_header.h
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/layoutitem_summary.h
/usr/include/glom-1.30/libglom/data_structure/layout/report_parts/layoutitem_verticalgroup.h
/usr/include/glom-1.30/libglom/data_structure/layout/static_text.h
/usr/include/glom-1.30/libglom/data_structure/layout/usesrelationship.h
/usr/include/glom-1.30/libglom/data_structure/numeric_format.h
/usr/include/glom-1.30/libglom/data_structure/print_layout.h
/usr/include/glom-1.30/libglom/data_structure/privileges.h
/usr/include/glom-1.30/libglom/data_structure/relationship.h
/usr/include/glom-1.30/libglom/data_structure/report.h
/usr/include/glom-1.30/libglom/data_structure/system_prefs.h
/usr/include/glom-1.30/libglom/data_structure/tableinfo.h
/usr/include/glom-1.30/libglom/data_structure/translatable_item.h