Recently, a change was committed to asterisk-{1.8.12.0,10.4.0} REQUIRED_USE="gtalk ( jabber )" It should rather be REQUIRED_USE="gtalk? ( jabber )" The issue was mentioned by jkroon on IRC.
Please correct; I am at a training course out in the countryside, the narrowband connectivity here is not very CVS-friendly. Note that this user submission passed repoman...
Fixed in CVS.
*** Bug 415983 has been marked as a duplicate of this bug. ***