On a Gentoo box with Systemd, after install sys-fs/zfs-9999, the Systemd service won't add. Because the ebuild author forgot to inherit "systemd" eclass.
Created attachment 356802 [details, diff] Fixed Systemd Support
Created attachment 356804 [details, diff] Fixed Systemd Support Oops. The first patch is totally wrong.
Fixed in latest CVS.