[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 chrstphrchvz):

 Replying to [comment:20 chrstphrchvz]:
 > Is this an issue to try `legacysupport.use_mp_libcxx yes` for?

 Added to PR: https://github.com/macports/macports-ports/pull/12638

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Ticket URL: <https://trac.macports.org/ticket/60853#comment:21>
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