This is not quite a bug, but rather an approaching challenge. See this thread on forums.gentoo.org [http://forums.gentoo.org/viewtopic-t-615494.html], in which I was asked to file a bug report. Concerning the upcoming PostgreSQL upgrade from 8.2 to 8.3, it's imperative that Gentoo implements an adequate transition procedure. Blocking the old version will create a 'chicken-and-egg' situation where you are left incapable of upgrading your existing databases. According to the developers, it's important that a dump of the old database should be done with the new 8.3 version of pg_dump. See this thread [http://archives.postgresql.org/pgsql-advocacy/2007-11/msg00051.php] on pgsql-advocacy for some details.
See bug #42894
We are not going to remove this until it's slotted, sorry. Killing DBs sucks a LOT more than your blocker issues.
*** This bug has been marked as a duplicate of bug 42894 ***