/usr/include/ is in libindicator-messages-status-provider-dev 0.6.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libindicator-messages-status-provider-1/
/usr/include/libindicator-messages-status-provider-1/status-provider.h
/usr/include/libindicator-messages-service/
/usr/include/libindicator-messages-service/messages-service-dbus.h
/usr/include/libindicator-messages-service/default-applications.h
/usr/include/libindicator-messages-service/gen-messages-service.xml.h
/usr/include/libindicator-messages-service/dirs.h
/usr/include/libindicator-messages-service/status-items.h
/usr/include/libindicator-messages-service/dbus-data.h
/usr/include/libindicator-messages-service/seen-db.h
/usr/include/libindicator-messages-service/launcher-menu-item.h
/usr/include/libindicator-messages-service/im-menu-item.h
/usr/include/libindicator-messages-service/app-menu-item.h