[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:  (none)
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:                       |       Port:  GrandPerspective
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 Failing build status:
 https://ports.macports.org/port/GrandPerspective/details/

 I can confirm the failure when it tries to rebuild locally on Mojave
 10.14.6.

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