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

[MacPorts]

#56087: ntpsec @1.1.0:  broken for macOS <10.13
------------------------+------------------------
  Reporter:  fhgwright  |      Owner:  lbschenkel
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  ntpsec     |
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Comment (by fhgwright):

 Replying to [comment:4 ryandesign]:
 > The developer of ntpsec is hostile toward macOS and is not interested in
 providing support for earlier versions of macOS that do not have features
 he wants to use in his software.

 Yeah, I know. :-) As seen here:
 {{{
 cc9491c82 Drop support for OS X 10.11.  Apple screwed this pooch too many
 different ways.
 }}}
 Though that was actually based on taking a wrong approach to fixing code
 that was broken in multiple ways, anyway.

 Supporting ntpsec on the Mac may eventually become intractable, but for
 now it's not *that* hard to fix, by reverting the two commits that broke
 10.12, and adding a few additional patches for <10.12.  Since the 10.12
 and <10.12 patches touch at least one common file, I didn't split them
 into separate patchfiles.

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Ticket URL: <https://trac.macports.org/ticket/56087#comment:5>
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