Festival is a full featured TTS (Text-to-Speech) engine. This package come with 5 preconfigured voices to choose from, though more can be customized by the user. Festival can act as a speech server, allowing other machines to send "voice messages".
Created attachment 1202 [details] festival-1.4.2.ebuild
I have sent in a new ebuild on bug 22053, that fixes this one, and updates festival to 1.4.3.