[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:  devans@…
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  leopard
      Port:  gtk3        |
-------------------------+----------------------

Comment (by jeremyhu@…):

 That would result in different ports using different C++ runtimes, causing
 issues across library boundaries.

 If you wanted to pursue that route, you could remove all C++ ports,
 install gcc6, setup your default compilers to be something like "gcc6 gcc5
 gcc4.9" and then re-install your ports.  You'll have to manually edit
 ports that blacklist *gcc* for C++11, including the cxx11 portgroup to
 accept your toolchain choice.

 That's not a supported option, and you will run into trouble...

 but that's the cost of trying to make a decade old system on a 9 year old
 OS work with current software.

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Ticket URL: <https://trac.macports.org/ticket/52468#comment:14>
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