/usr/include/ is in libgrss-dev 0.7.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libgrss/
/usr/include/libgrss/feed-atom-formatter.h
/usr/include/libgrss/feed-formatter.h
/usr/include/libgrss/feed-enclosure.h
/usr/include/libgrss/feed-rss-formatter.h
/usr/include/libgrss/person.h
/usr/include/libgrss/feeds-group.h
/usr/include/libgrss/feeds-publisher.h
/usr/include/libgrss/feed-parser.h
/usr/include/libgrss/feed-item.h
/usr/include/libgrss/feed-channel.h
/usr/include/libgrss/feeds-subscriber.h
/usr/include/libgrss/feeds-store.h
/usr/include/libgrss/libgrss.h
/usr/include/libgrss/feeds-pool.h