[MacPorts] #64934: py-re2: failing to build for macOS 10.8, and broken since 2019 or earlier; mutex file not found

[MacPorts]

#64934: py-re2: failing to build for macOS 10.8, and broken since 2019 or earlier;
mutex file not found
----------------------+--------------------
  Reporter:  mascguy  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.2
Resolution:           |   Keywords:
      Port:  py-re2   |
----------------------+--------------------

Comment (by kencu):

 a likely issue is that the wrong {{{-stdlib}}} is being used on 10.8.

 clang on 10.8 defaults to {{{-stdlib=libstdc++}}} if there is none
 specified on the build line.

 If you can get {{{-stdlib=libc++}}} onto the build line, then it will
 probably work. I say probably, because I altered the default behaviour for
 MacPorts' clangs to default to libc++ on appropriate MacPorts installs
 even on 10.8, so clang-13 should actually work.

 But at any rate, best to get the stdlib onto the build line and then see
 what gives.

-- 
Ticket URL: <https://trac.macports.org/ticket/64934#comment:4>
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