Build notes from LordCrc: viewtopic.php?f=30&t=8528
Also, this build is slightly newer than the Windows/Linux builds, it contains a fix for hybrid bidir plus some extra code jeanphi committed for light sampling (see this post: viewtopic.php?f=8&t=7480&start=60#p81721
Download link: (build is no longer on server)
Build is 64bit only, should work on 10.6 or 10.7. I haven't actually done a release build of Lux in a few months though, so I might have messed something up. Let me know if there are any issues. Luxblend (with pre-packed pylux) is included.