This relates the the gnome-experimental ebuilds on gentoo overlays. If this is not the correct place to place such a bug, then please correct me. As seen at http://www.mail-archive.com/deskbar-applet-list@gnome.org/msg00556.html, deskbar-applet-2.15.91 requires evolution-data-server-1.7 instead of 1.2 (when using esd). The compile error presented at http://www.mail-archive.com/deskbar-applet-list@gnome.org/msg00555.html is identicle to the error that control-center gives me, so I assume it needs 1.7 as well.
Fixed, thanks.