[MacPorts] #68522: KeePassXC 2.7.6_0 < 2.7.6_1 Fails to build on Mavericks

[MacPorts]

#68522: KeePassXC 2.7.6_0 < 2.7.6_1 Fails to build on Mavericks
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  Reporter:  tehcog     |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:  mavericks
      Port:  KeePassXC  |
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Comment (by tenzap):

 Could someone update the portfile so that it builds on older versions of
 macOS?

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Ticket URL: <https://trac.macports.org/ticket/68522#comment:10>
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