Gosh, no idea, sorry. I don't even have the machine I last built that on around (I backed up the source code, but I haven't built it, and I don't even have visual c++ installed on my current machine). If it helps, I was working on this in late 2007, so its probably whatever the latest version Boost was back around that time. I seem to recall I just copied over a few of the boost headers - I didn't use much from it.