https://bugzilla.redhat.com/show_bug.cgi?id=1238804
--- Comment #14 from Harald Reindl h.reindl@thelounge.net --- BIND_NOW is -z now aka "Full RELRO" http://tk-blog.blogspot.co.at/2009/02/relro-not-so-well-known-memory.html
it's peferred but not always possible