Just a quick one tyo save a few headaches ;)
If you recently upgraded to portage-184.108.40.206 or 2.2.0_alpha74, you might want to read the Changelog:
*portage-2.2.0_alpha74 (11 Nov 2011)
11 Nov 2011; Zac Medico <firstname.lastname@example.org> +portage-2.2.0_alpha74.ebuild,-portage-2.2.0_alpha73.ebuild: 2.2.0_alpha74 version bump. This includes the --quiet-build change that's in portage-220.127.116.11. Bug #210077 tracks all bugs fixed since portage-2.1.x.
*portage-18.104.22.168 (11 Nov 2011)
11 Nov 2011; Zac Medico <email@example.com> +portage-22.214.171.124.ebuild,-portage-126.96.36.199.ebuild:
188.8.131.52 version bump. The emerge --quiet-build option is now enabled by default. Set --quiet-build=n in MERGE_DEFAULT_OPTS if you want to disable it by default. See the emerge(1) man page for more information about this option. Bug #381649 tracks all bugs fixed since portage-184.108.40.206.
So for those of you (like me) who want the old behaviour back, just append:
to your make.conf