[MacPorts] #67421: gtk3 fails to build with +universal (was: Building with '+universal' variant on MacOS 10.13.6)

[MacPorts]

#67421: gtk3 fails to build with +universal
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  Reporter:  RobbieNutland  |      Owner:  mascguy
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  gtk3           |
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Comment (by jmroot):

 See also: https://lists.macports.org/pipermail/macports-
 users/2023-April/052054.html

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Ticket URL: <https://trac.macports.org/ticket/67421#comment:3>
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