[MacPorts] #58978: Unable to Upgrade xar or python27 - Fails to configure

[MacPorts]

#58978: Unable to Upgrade xar or python27 - Fails to configure
---------------------------+--------------------
  Reporter:  RobK88        |      Owner:  (none)
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:  worksforme    |   Keywords:  lion
      Port:  xar python27  |
---------------------------+--------------------

Comment (by kencu):

 Everyone using LibcxxOnOlderSystems is likely going to run into this. Not
 many are using MacPorts 2.6 yet. Might leave it open, but up to you.

 Even with the new setup, once someone on 10.6.8 has clang-8.0 installed,
 my understanding is that MacPorts will then try to use that preferentially
 -- and it will be broken -- unless I'm missing something.

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Ticket URL: <https://trac.macports.org/ticket/58978#comment:10>
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