Crossdev isn't going to work without openrc installed, as it seems to use it all over the shop. Reproducible: Always
/etc/init.d/functions.sh is part of the core Gentoo system
No, OpenRC it's not necessarily part of the core Gentoo system. Not anymore since the inclusion of virtual/service-manager, which systemd satisfies, and therefore OpenRC may be removed when --depclean'ing if you use systemd.
(In reply to Canek Peláez Valdés from comment #3) i didn't say openrc. see bug 373219.