C++11

I'm on a MAC OS X Lion, and I've tried developing via Xcode, NetBeans, and Code::Blocks. They work quite well.

But I can't use C++11. I don't know much about IDEs vs just using compilers/debuggers/etc. Do IDEs rely on preexisting compilers? If so, that may be why I'm having this trouble, and how do I update my compiler? (Again, I'm on a MAC.) If not, then do I just blame outdated IDEs?
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