[MacPorts] #70223: gtkmm4: Undefined symbols for architecture arm64

[MacPorts]

#70223: gtkmm4: Undefined symbols for architecture arm64
---------------------------+--------------------
  Reporter:  chaochinyang  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  gtkmm4        |
---------------------------+--------------------

Comment (by kencu):

 OK. It can be tricky to fully sort things out, certainly.

 macports is not likely to spend resources sorting out how to make the
 gtkmm4 demo program build with g++ on Intel or arm64.

 Someone interested in PPC might be, if the error happens there, as gcc is
 the only usable compiler for darwin ppc.

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Ticket URL: <https://trac.macports.org/ticket/70223#comment:7>
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