libc++: bad ./testit results on 10.6

Hello there,

I want to use libc++ and clang to satisfy my needs for an up-to-date
compiler on a 10.6 machine. I compile both directly from svn [2].
However, when I run ./testit, I get these results: [1].

Is anybody out there using libc++ on 10.6? Are you using it on a daily
basis on 10.6, yet? What are your results? Can you build boost, or Qt
with libc++? Should I worry about those failed tests?

Thanks in advance,
Benjamin

[1] ./testit results: