libX11 has no C++ code, so the error probably has nothing to do with the C++ 
library chosen.

Please do open a ticket with whatever relevant data you can provide.

> On Mar 24, 2017, at 14:24, Ryan Schmidt <[email protected]> wrote:
> 
> 
> On Mar 24, 2017, at 14:48, db <[email protected]> wrote:
> 
>> On 24 Mar 2017, at 19:23, Ryan Schmidt <[email protected]> wrote:
>>> I agree that ticket describes the error you encountered. It was closed 
>>> because nobody could explain it and the problem went away for the reporter. 
>>> You could re-open it and add your new information to it.
>> 
>> Re-open #52335 while it's for different OS and Xcode versions?
> 
> Or file a new ticket, making reference to the old one. It's the same error 
> message, so it may well be the same cause. Or it may not. I don't know.
> 
>> Fwiw, I could try building xorg-libX11 from source but with libstdc++, first.
> 
> There are two possibilities. 1. xorg-libX11 doesn't build when built for a 
> non-default c++ stdlib. If you think this is the problem, then file a ticket. 
> 2. There is a problem on your computer that prevents xorg-libX11 from 
> building in any situation. If you believe that is the case, then try to build 
> it with libstdc++. (We already know it builds fine with libstdc++ on 10.8 on 
> our automated build system.)
> 
> 
>> On Mar 24, 2017, at 14:50, db <[email protected]> wrote:
>> 
>> On 24 Mar 2017, at 19:21, Ryan Schmidt <[email protected]> wrote:
>>> Upgrading to a version of macOS with libc++ as default (10.9 and later) 
>>> will probably make your MacPorts life easier, but it's up to you of course.
>> 
>> Despite the overall lower quality and usability of 10.9+, I don't see how, 
>> since MP in 10.8 can be configured to use libc++.
> 
> I can't speak to the lower quality and usability that you perceive. I can 
> only tell you that build systems are finicky things, many of them are 
> nonstandard, and there are probably many of our ports that do not properly 
> pass the c++ stdlib flags to the build system, which will lead to problems 
> most port developers have not encountered, so you may be encountering them 
> and having to help test and resolve them.
> 
> 
>>>> problems with python2_select (needed base updated)
>>> What do you mean?
>> 
>> I don't remember the exact error, but it failed to compile — it succeeded 
>> when I upgraded the base from 2.3.x to 2.4.1.
> 
> Ok, probably the "-q" flag we added to reinplace in 2.4.0. We never support 
> old versions of MacPorts. Always use the current version.
> 
> 
>>>> and xorg-libX11 (attached config.log), which is working fine in another 
>>>> system with same versions.
>>> Another 10.8 system that you've also switched to libc++? Any differences 
>>> between the two systems you can think of?
>> 
>> OS X 10.8.5, Xcode 5.1.1, MP 2.4.1 — no differences that come to mind.
> 
> If the other 10.8 system also was switched to libc++ then I would believe 
> there is a problem with this system that does not exist on your other 10.8 
> system. The problem could be an older version of Xcode, or mismatched or 
> missing version of the command line tools.
> 
> 
>>> Not really. You could run into build problems. If you do, and it doesn't 
>>> seem to be because of something unique to your system, please let us know.
>> 
>> Should I expect to encounter problems when switching to building from source 
>> with libc++ for the same ports whose binaries work fine with libstdc++? 
> 
> Certainly; libc++ on 10.8 is a nonstandard configuration that most MacPorts 
> developers have never tested; as such, you're bound to run into 
> as-yet-undiscovered problems that will need to be diagnosed and fixed by 
> someone.
> 
> In addition, you can run into the conflicts anyone could run into when 
> building from source that can arise when building software on non-pristine 
> systems. (Our binaries are produced on our buildbot system which is 
> "pristine" because it has no third-party software installed and no MacPorts 
> ports active when each port is built, ensuring there can be no conflicts.)
> 

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