[MacPorts] #52468: gtk3 3.22.0_0 build fails on 10.5 ppc

[MacPorts]

#52468: gtk3 3.22.0_0 build fails on 10.5 ppc
-------------------------+-----------------------------
  Reporter:  dgonyier@…  |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  leopard powerpc
      Port:  gtk3        |
-------------------------+-----------------------------

Comment (by ballapete):

 GCC 6.2.0 at least can change the error GNU Emacs produces when crashing
 upon launch, besides creating runable binaries:

 {{{
 emacs:44300): Gtk-WARNING **: gtk_window_parse_geometry() called on a
 window with no visible children; the window should be set up before
 gtk_window_parse_geometry() is called.

 (emacs:44300): Gtk-CRITICAL **: gtk_distribute_natural_allocation:
 assertion 'extra_space >= 0' failed
 }}}

 And GTK3 can perform one thing reliably well: Launching another completely
 useless X server. Which reminds me of MS Windows.

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Ticket URL: <https://trac.macports.org/ticket/52468#comment:54>
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