Wow, I compiled OBS redux on Gentoo the other day, and was very happy to see it worked pretty much straight away. Deeply impressed. Just had to unmask a few libraries to get the QT5 stuff in, and switched from avconv to ffmpeg (not sure if this was strictly necessary, but swresample wasn't found until I did).
The latest pull brought in fdk, I am not sure but this (or some other changes to audio) seems to have fixed the audio lag issues. Very cool the way it sets up the pulse sinks - from what I can see, there is just one sink now, and you mix mike and desktop with OBS. Before I was mixing in both pulse and in OBS.
The only thing that doesn't work for me is streaming to twitch. OBS connects fine, and the audio gets to the twitch feed, but no video comes through. I am guessing that this is a codec issue, perhaps relating to the ffmpeg I am using.
If anyone has streaming to twitch working, could you let me know the version of ffmpeg/avconv you are using?