[MacPorts] #59074: [mysql8] compile failure on 10.6.8 x86_64

[MacPorts]

#59074: [mysql8] compile failure on 10.6.8 x86_64
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  Reporter:  BjarneDMat  |      Owner:  herbygillot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.0
Resolution:              |   Keywords:  snowleopard
      Port:  mysql8      |
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Comment (by kencu):

 All systems 10.10 and less fail to build `mysql8` due to the same
 `_SC_PHYS_PAGES` error, which supports this bit of info I found `//
 _SC_PHYS_PAGES is defined as of Apple SDK 10.11`.

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Ticket URL: <https://trac.macports.org/ticket/59074#comment:9>
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