clang and gcc7

[Jeremy Huddleston Sequoia]

+mcalhoun

Marcus maintains that variant since I don't have the bandwidth to give it the requisite testing.

Marcus, you might also consider installing the stdc++ headers with the libgcc port and updating the dependency here to libgcc/libgcc-devel.

> On Sep 6, 2017, at 09:52, Ken Cunningham <ken.cunningham.webuse at gmail.com> wrote:
> 
> see also <https://trac.macports.org/ticket/54766>
> 
> On 2017-09-06, at 9:44 AM, <mf2k at macports.org> <mf2k at macports.org> wrote:
> 
>> Is there a reason that clang-4.0 +libstdcxx (the default) requires gcc6? I am switching to gcc7 and would like to not depend gcc6 anymore. The same is true for clang-5.0. 
>> 
>> 
>> Cheers!
>> Frank
>> 
>