Time to bootstrap the system (See moving from stage 1 to stage 2). If you have multiple machines on the network, all with the same version of gcc, now is the when you’ll want to configure your distcc configuration.
# cd /usr/portage
# scripts/bootstrap.sh
This will take a while to run (update: took 8 hours to run). If the bootstrap script fails, and you’re re-using a portage tree (or possibly other files under /opt, /usr, /var, /home, /tmp or /var/tmp), then you may need to clean out the old files. (Generally not an issue if you’re doing a fresh install.)
Once that finishes, run the following command.
# emerge system
Which will also take a while to run (last time it took around 5.5 hours). Update: Took around 4.5 hours this time.