/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ is in ejabberd 16.09-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ELDAPv3.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/XmppAddr.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/adhoc.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_commands.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_config.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_ctl.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_http.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_oauth.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_service.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_sm.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_sql_pt.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ejabberd_web_admin.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/eldap.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/http_bind.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/jlib.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/logger.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_announce.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_caps.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_carboncopy.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_irc.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_last.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_mam.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_muc.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_muc_room.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_offline.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_privacy.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_private.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_proxy65.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_roster.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_shared_roster.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_vcard.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/mod_vcard_xupdate.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/ns.hrl
/usr/lib/x86_64-linux-gnu/ejabberd-16.09/include/pubsub.hrl