When your Gentoo stuff is broken, try researching these:

List of magic Gentoo commands:

1. revdep-rebuild
2. lafilefixer
3. python-updater
4. perl-cleaner

Better known Gentoo commands:

1. emerge
2. etc-update
3. genkernel
4. eselect
5. equery

Not sure how well known these commands are:

1. gcc-config