(chroot) Gentoo-2012 gentoo # USE="-doc symlink" emerge gentoo sources
 * Last emerge --sync was 202d 14h 38m 20s ago.
Calculating dependencies                         ... done!

emerge: there are no ebuilds to satisfy "sources".

emerge: searching for similar names...
emerge: Maybe you meant any of these: sys-kernel/rt-sources, sys-kernel/pf-sources, sys-kernel/mm-sources?