the ebuild for net-misc/openvpn-2.2.0 refers to the eurephia use flag but isn't declared. In any case, eurephia has been merged into openvpn 2.2. net-misc/openvpn-2.2.0-r1 seems to fix the use flag reference. Why keep net-misc/openvpn-2.2.0 then? Reproducible: Always
I've removed 2.2.0, you can rest assured.