kdesu / gksu in Cinnamon 3.6.6

[Gladdle]

Again, i didn't get it. I have a systemd- free Gentoo System with Cinnamon 3.6.6 (See in this Threat). Since this installation i have switched to Cinnamon from KDE. In KDE i have kdesu for start Apps as Administrator (ONLY for System Tools like gparted or porthole), in gnome (and Cinnamon is imho gnome2 based) it's gksu. But if i do a "emerge --update gksu" the system got a lot of depency- errors and want to have the use flag "systemd". Is there a solution for the Problem or maybe a alternative "su" for cinnamon?
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Meine Gentoo Linux Konfiguration: Notebook (ACER Aspire 9920G)