[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):

 use clang++ instead

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Ticket URL: <https://trac.macports.org/ticket/70223#comment:3>
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