There is currently no TURN server available in Gentoo, as far as I (and eix) know. https://code.google.com/p/rfc5766-turn-server/ is an example of one.
Created attachment 374814 [details] ebuild draft for latest 3.2.3.4 version needs still some work: * enable examples USE flag * bzip2 -d all examples and their relative docs * bring postinstall.txt messages inside post_install() * QA