ppc64 is the only arch to have KEYWORDS in 2.15.91.0.1 and it was only for unstable ... 2.15.92.0.2+ had ~ppc64 added to them recently so whenever you guys are comfortable, please remove 2.15.91.0.1 from portage
removed in CVS
Looks like this has been done and ppc64 is up to 2.16.* now so time to stick a fork in it!