[MacPorts] #61653: gimp-gap-devel @2.7.0-20191012+quartz fails to build on Catalina

[MacPorts]

#61653: gimp-gap-devel @2.7.0-20191012+quartz fails to build on Catalina
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  Reporter:  p-bro           |      Owner:  dbevans
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  gimp-gap-devel  |
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Comment (by p-bro):

 Following the discussion in #61261 on XCode 12 and throwing an error
 instead of a warning for implicit definitions, I downgraded Xcode to Xcode
 11.7 11E801a, with unchanged results: still the same error as above.

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Ticket URL: <https://trac.macports.org/ticket/61653#comment:2>
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