[MacPorts] #59357: Pallet: Build Failure on Catalina 10.15. error: Compiling for earlier than macOS 10.6 is no longer supported. huh?

[MacPorts]

#59357: Pallet: Build Failure on Catalina 10.15. error: Compiling for earlier than
macOS 10.6 is no longer supported. huh?
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  Reporter:  coolbikerdad  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  Pallet        |
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Comment (by phochstr):

 The problem is that MainMenu.xib is in an old file format, apparently
 pre-10.6.
 For Catalina, it needs to be updated to Xcode's current file format and
 compiled in that version.
 There is also a slew of error messages that require some changes to the
 layout.

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Ticket URL: <https://trac.macports.org/ticket/59357#comment:5>
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