[MacPorts] #57751: qt4-mac: lots of errors trying to build with clang-7.0 (presumably related to defaulting to c++17 mode)

[MacPorts]

#57751: qt4-mac: lots of errors trying to build with clang-7.0 (presumably related
to defaulting to c++17 mode)
----------------------+-----------------------
  Reporter:  kencu    |      Owner:  michaelld
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  qt4-mac  |
----------------------+-----------------------

Comment (by ryandesign):

 Now that we are defaulting to clang 9.0 on Snow Leopard, qt4-mac doesn't
 build there anymore:

 https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/4114/steps
 /install-dependencies/logs/stdio

 This is sad since Snow Leopard is probably one of the systems on which
 qt4-mac would be most useful.

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Ticket URL: <https://trac.macports.org/ticket/57751#comment:10>
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