/usr/include/ is in libappstream-dev 0.12.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/appstream/
/usr/include/appstream/appstream.h
/usr/include/appstream/as-bundle.h
/usr/include/appstream/as-category.h
/usr/include/appstream/as-checksum.h
/usr/include/appstream/as-component.h
/usr/include/appstream/as-content-rating.h
/usr/include/appstream/as-distro-details.h
/usr/include/appstream/as-enums.h
/usr/include/appstream/as-icon.h
/usr/include/appstream/as-image.h
/usr/include/appstream/as-launchable.h
/usr/include/appstream/as-metadata.h
/usr/include/appstream/as-pool.h
/usr/include/appstream/as-provided.h
/usr/include/appstream/as-relation.h
/usr/include/appstream/as-release.h
/usr/include/appstream/as-screenshot.h
/usr/include/appstream/as-spdx.h
/usr/include/appstream/as-suggested.h
/usr/include/appstream/as-translation.h
/usr/include/appstream/as-utils.h
/usr/include/appstream/as-validator-issue.h
/usr/include/appstream/as-validator.h