[MacPorts] #69471: gtk2 @2.24.33_3+quartz fails to build: incompatible function pointer types

[MacPorts]

#69471: gtk2 @2.24.33_3+quartz fails to build: incompatible function pointer types
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  Reporter:  DrLex0     |      Owner:  mascguy
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.9.1
Resolution:             |   Keywords:
      Port:  gtk2 gimp  |
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Comment (by DrLex0):

 I didn't have to fix anything about the m4 message, it only seems to be a
 nuisance but it doesn't interfere with the builds.

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Ticket URL: <https://trac.macports.org/ticket/69471#comment:6>
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