> On Oct 6, 2016, at 7:40 AM, René J.V. Bertin <rjvber...@gmail.com> wrote:
>> We want to move the matter of determining that an error condition exists
>> from the portfiles and portgroups to MacPorts base. Then it will be easier
>> for the buildbot to query MacPorts base and ask if the port will be
>> installable, and skip it if not
> I think we're not exactly thinking about the same things. I don't think you 
> can expect ports to know that without being able to include the PortGroups 
> they require. So even if the fundamental mechanism is part of the base layer 
> the error could still be determined in a PortGroup. And I think it'd make 
> sense if the cxx11 portgroup raised the "don't build" signal if it detects a 
> host that doesn't have libc++ installed.

I've explained the matter as best I can. You can refer to the mailing list 
archives for more details, specifically Clemens' explanation for why the matter 
must be handled by MacPorts base, not ports.

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