[MacPorts] #60853: port mysql8 @8.0.21 fails to build on less than macOS 10.12 due to system libc++ being too old

[MacPorts]

#60853: port mysql8 @8.0.21 fails to build on less than macOS 10.12 due to system
libc++ being too old
----------------------------+-------------------------
  Reporter:  wadjei         |      Owner:  herbygillot
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:  mavericks
      Port:  mysql8 libcxx  |
----------------------------+-------------------------

Comment (by kencu):

 best thing to do right now is hold back the version on < 10.12. See
 <https://github.com/macports/macports-
 ports/commit/128bccde6a70c292fec60cd7ba8186e8c7d89d85#diff-
 f49ca2ea72c829ea3187b231e55ed43c>

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Ticket URL: <https://trac.macports.org/ticket/60853#comment:10>
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