My comment was a little sloppy. This is really a fix for libc++, which is C++11 only. So if you are compiling with libc++ headers, you want to be in C++11 mode.

There is not an upstream fix yet. We will likely do something in the configure script.

In the light of morning, I think this was a sloppy fix. I'm going to withdraw it for now, and think about how to make it a more precise check. Apologies for the noise.