It was whatever the build was previous to the current one listed which was compiled in February.
I don't have a 64-bit cpu so I can't compile the source code myself. If you have that option I would reccomend it; just let it go overnight because it will take a long time.
The newer versions are probably better. Based on what I saw, though, I don't like the direction of the project whatsoever. This is coming from someone who doesn't like Chrome as a browser though, so YMMV. GL