[MacPorts] #56087: ntpsec @1.1.0: broken for macOS <10.13

[MacPorts]

#56087: ntpsec @1.1.0:  broken for macOS <10.13
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 Reporter:  fhgwright  |      Owner:
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  ntpsec
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 Between the 1.0.0 release and the 1.1.0 release, ntpsec reduced Mac
 compatibility further such that it no longer builds on 10.12 (though this
 isn't reflected in the Portfile).  I'm currently testing a fix for this,
 adapted from already working code in my own ntpsec repo.

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Ticket URL: <https://trac.macports.org/ticket/56087>
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