[MacPorts] #68112: gtk3 @3.24.38+universal: Error: gtk3 requires at least one architecture runnable on this machine to be able to build universally

[MacPorts]

#68112: gtk3 @3.24.38+universal: Error: gtk3 requires at least one architecture
runnable on this machine to be able to build universally
------------------------+----------------------
  Reporter:  Liontooth  |      Owner:  mascguy
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  arm64
      Port:  gtk3       |
------------------------+----------------------

Comment (by jmroot):

 There's a part in the Portfile where it tries to figure out which archs
 can be run on the build machine. It looks like this code doesn't account
 for arm64 systems.

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Ticket URL: <https://trac.macports.org/ticket/68112#comment:2>
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