I just checked out libc++ revision 131708 a few minutes and tried to build with clang 3.0.
$ clang++ -v
clang version 3.0 (trunk 131637)
Thread model: posix
I downloaded the helper libs and exported TRIPLE. I get the errors below. Am I doing something wrong? Is this expected? Thanks for your help. I want to play around with some C++0x features so I decided to use clang and libc++.