[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
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  Reporter:  mascguy  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.2
Resolution:           |   Keywords:
      Port:  py-re2   |
----------------------+--------------------

Comment (by mascguy):

 Replying to [comment:2 reneeotten]:
 > it builds everywhere else so its likely using C++11 stuff that isn't
 supported by the compiler that gets selected on 10.8. I have no way of
 troubleshooting this nor real interest to be honest.. do you need this for
 anything on 10.8 or you just noticed that it doesn't build?

 It's blocking downstream builds of various dependents, so we really need
 to fix.

 I quickly tried to fix, by blacklisting older Xcode clangs. But still
 fails, even when compiling with MacPorts Clang 13.

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Ticket URL: <https://trac.macports.org/ticket/64934#comment:3>
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