port requires c++1y -> use cxx11 portgroup?

[Ken Cunningham]

> 
> 
> The main thing you get is that, without that portgroup, it will attempt to build on older OS X and fail. It also supports the https://trac.macports.org/wiki/LibcxxOnOlderSystems <https://trac.macports.org/wiki/LibcxxOnOlderSystems> workflow for those users who have done it to get C++11 and later on older OS X versions.
> 

Exactly what is happening, according to buildbots (works great on 10.6.8 with libcxx tho).

I was just going to throw in the cxx11, but hey - I’m learning not to do stuff like that without asking permission.

K



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