Handling C++11

[Marcus Calhoun-Lopez]

> On Jan 17, 2017, at 1:08 PM, Ken Cunningham <ken.cunningham.webuse at gmail.com> wrote:
> 
> Anyway, point of all this is that I'm extremely impressed with the way
> the macports devs and Jeremy have enabled libc++ / modern llvm-clang
> on 10.6 and 10.7, and would hate to see us move very far away from
> that or overly confuse the issue. The current situation is just
> fantastic for 10.6/10.7, and uses largely the same portfile structure
> as 10.9+, minimizing hassles for port authors.

You bring up some important considerations (including not overly confusing the issue).
Just to be clear, however, for those people using libc++, nothing would change, even using the new PortGroup.

-Marcus