I suspect it intends to depend on sys-apps/devicekit-power?
commit 8d48de85de75d232eb60de8ce3c33f8c37a3c0b7 Author: Nirbheek Chauhan <nirbheek@gentoo.org> Date: Sun Jul 26 20:59:02 2009 +0530 DeviceKit has been merged into udev[extras] some i**** thought it was funny to remove something that is actually used...
Right. I thought I'd bumped everything that depended on devicekit to a version that didn't depend on devicekit (-disks, -power, gnome-disk-utility). Apparently gnome-power-manager likes to test for devicekit even if it doesn't use it. Anyway, commit reverted till we get a 2.27* version which *doesn't* pull in devicekit. (2.27.2 still does)