[MacPorts] #67940: GrandPerspective fails to build Mojave and older

[MacPorts]

#67940: GrandPerspective fails to build Mojave and older
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  Reporter:  thomasrussellmurphy  |      Owner:  amake
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  GrandPerspective     |
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Comment (by thomasrussellmurphy):

 Would it be possible to make a version of the port from before the SDK
 upgrade to support older systems, then let this port stick with upstream?

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Ticket URL: <https://trac.macports.org/ticket/67940#comment:4>
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