As of Wednesday, July 4, 2012 at approximately 10:00 UTC, the manifest
hashes used on the gentoo-x86 tree will change to "SHA256 SHA512
WHIRLPOOL". To facilitate this change, developers MUST be using at
least portage-220.127.116.11 (or portage-2.2_alpha89), or, if your
dev-lang/python is built with USE="-ssl", portage-18.104.22.168 (or
portage-2.2_alpha95) or later is required.
For users, if they are on a older portage, it will gracefully
downgrade. For developers, however, not using a supported version will
cause tree inconsistencies. Developers will also need to make sure
they cvs up metadata/layout.conf (or cvs up the entire tree) after
this change occurs before making any commits.