[MacPorts] #63716: macos12: gtk3-demo-application just shows black frame

[MacPorts]

#63716: macos12: gtk3-demo-application just shows black frame
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  Reporter:  MStraeten  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:  monterey gtk
      Port:  gtk3       |
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Comment (by MStraeten):

 Build with xcode12 and sdk 10.15 is fine.

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Ticket URL: <https://trac.macports.org/ticket/63716#comment:2>
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