During the initial bootstrap, Gentoo downloads the packages for various applications (including glibc, gcc, binutils, gettext, etc.) using a "generic" make.conf rather than the customized make.conf created by the user. As was illustrated during the recent ibiblio outage, this means that the use of mirrors is impossible during initial installations. While a minor annoyance for single-system installations affected by rare outages, it could be a substantial problem for larger installations intending to run installations from a local mirror. Suggested fix: Download the packages required for bootstrap.sh before switching the custom make.conf for the generic one.
This should now be fixed.