building from source with libc++

[db]

On 28 Mar 2017, at 17:31, "Daniel J. Luke" <dluke at geeklair.net> wrote:
> On Mar 28, 2017, at 9:55 AM, db <iamsudo at gmail.com> wrote:
>> Is there any MP official notice of support?
> It's right there on https://www.macports.org

That is not. And one thing is targeting mainly systems still supported by Apple, another going along with it and dropping support for legacy versions and yet another building for the most compatibility, like some out there intend. These nuances are not in the link you provided.