The BUILD_PREFIX macro is missing in /etc/make.globals, which will result in an error with bootstrapping gentoo.
Um, BUILD_PREFIX is now an internal variable, so as of 2.0.34 this problem should be resolved
Moving these so we can remove the "Install CD" component from "Gentoo Linux". I apologize to everyone for this spam, but according to the bugzilla developers, this is the only reasonable way to do this.