Gentoo

My personal Gentoo Overlay

Overlay First installation

layman -o https://raw.githubusercontent.com/xavierforestier/gentoo/master/overlay.xml -f -a xavierforestier

eix-update

Overaly Update

layman -S: Sync overlay(s) including this one
eix-update: Update eix database
emerge -uva [...]: Update stuffs...

ffado stuffs

Jack2 / ffado install

USE=-iee1394 emerge jack2: Install Jack2 without ffado support : Jack2 (or jack-audio-connection-kit) is a pre-requisite for building ffado.
emerge libffado: Install ffado lib
USE=iee1394 emerge jack2: Rebuild Jack2 with ffado support

Note: if you experience issue with multilibs, you may have to force 32bits supports in /etc/portage/package.use
media-sound/jack2 abi_x86_32
media-libs/libffado abi_x86_32

Jack2 configuration

jack_control dl : Make sure firewire (ffado) driver is listed
jack_control ds firewire : Setup firewire driver as default one
jack_control dg : Check firewire is default one
jack_control ep : Dispay default drivers setting (adjust if necessarry)
Finally launch QJackCtl then your favorite app :)