Right, I had to reformat  because the Mac wouldn't boot anymore. 

This is actually a failure on step 1, the

sudo port install -v -f libcxx

Hope that helps.

Enviado desde mi iPhone

> El 14 mar 2016, a las 5:19, Ryan Schmidt <ryandes...@macports.org> escribió:
> 
> 
>> On Mar 14, 2016, at 2:14 AM, [ftp83plus] <ges...@ftp83plus.net> wrote:
>> 
>>> El 2016-03-13, a las 22:14, Brandon Allbery escribió:
>>> 
>>> On Sun, Mar 13, 2016 at 10:10 PM, Chris Jones <jon...@hep.phy.cam.ac.uk> 
>>> wrote:
>>> Unordered_set is only available in C++11, which the ancient gcc 4.2 
>>> compiler being used will not support... 
>>> 
>>> Then something has gone wrong because, per subject line, it's supposed to 
>>> be using a newer clang built with libc++ (aka C++11) support.
> 
> 
>> So is it a case of missing instruction or variant? 
>> That one dependency would precisely need the very compiler I am trying to 
>> install in case I happen to need it for a recent software written under 
>> C++11standard?
> 
> 
> It is difficult for me to follow this thread because it has gone on so long 
> and you're not telling us exactly what step of the process you're stuck on.
> 
> Last month you said you were able to follow the instructions successfully...
> 
> https://lists.macosforge.org/pipermail/macports-users/2016-February/040540.html
> 
> 
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