[MacPorts] #53903: freeciv @2.5.6: warning "deprecated Carbon Component Manager for hosting Audio Units" on running freeciv-gtk2 or freeciv-sdl

[MacPorts]

#53903: freeciv @2.5.6: warning "deprecated Carbon Component Manager for hosting
Audio Units" on running freeciv-gtk2 or freeciv-sdl
----------------------------------+-------------------
  Reporter:  JDLH                 |      Owner:
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.4.1
Resolution:                       |   Keywords:
      Port:  freeciv-x11 freeciv  |
----------------------------------+-------------------

Comment (by kencu):

 It'll be SDL1.2.

 <https://github.com/schismtracker/schismtracker/issues/33>

 <https://bugzilla.libsdl.org/show_bug.cgi?id=3127>

 Nothing to worry about just now, but perhaps someday SDL1.2 won't compile
 on some new macOS version.

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Ticket URL: <https://trac.macports.org/ticket/53903#comment:1>
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