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Anyone on OS X 10.9. I haven't been able to link to the lib with it yet.
The problem is LLVM std. If I set it to GNU libstdc++, it works fine.
Working solution if you need (as I do) both libs: Leave std as libc++ but link (other linker flags in Xcode) to libstdc++ (/usr/lib/libstdc++.dylib)