[MacPorts] #54357: Qt5 : 5.9, 5.8 and Mac OS X 10.9

[MacPorts]

#54357: Qt5 : 5.9, 5.8 and Mac OS X 10.9
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  Reporter:  RJVB    |      Owner:  (none)
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  qt5*    |
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Comment (by chrstphrchvz):

 Long term support for Qt 5.9 ended 2020-05. I suggest this proposal be
 abandoned, and for a minimum macOS version be set in `qt59` to prevent
 building on earlier versions.

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Ticket URL: <https://trac.macports.org/ticket/54357#comment:9>
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