[MacPorts] #65638: libcxx: builds failing for 10.6, blocking downstream ports

[MacPorts]

#65638: libcxx: builds failing for 10.6, blocking downstream ports
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  Reporter:  mascguy                    |      Owner:  catap
      Type:  defect                     |     Status:  assigned
  Priority:  High                       |  Milestone:
 Component:  ports                      |    Version:  2.7.2
Resolution:                             |   Keywords:  leopard
      Port:  libcxx clang-11-bootstrap  |
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Comment (by mascguy):

 Kirill, let me know if this is something you'll be able to look at ASAP.

 If not, then no worries. But if we can't resolve within the next 24-48
 hours, we might need to revert for now.

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Ticket URL: <https://trac.macports.org/ticket/65638#comment:2>
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