[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):

 to answer that question, add some verbosity flags to the build, and
 compare them.

 These should do it:

 {{{
 -v  -Wl,-v
 }}}

 it could be that specifying -std=libc++ makes a difference. clang++ does
 that by default. g++ needs to have that manually added, as it defaults to
 it's own stdlib.

-- 
Ticket URL: <https://trac.macports.org/ticket/70223#comment:5>
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