[MacPorts] #52922: qt5 @5.6.2_0: build errors on 10.7

[MacPorts]

#52922: qt5 @5.6.2_0: build errors on 10.7
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  Reporter:  mojca                               |      Owner:
                                                 |  MarcusCalhoun-Lopez
      Type:  defect                              |     Status:  new
  Priority:  Low                                 |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:  lion
      Port:  qt5 qt5-qtdoc ​qt5-qtmultimedia     |
  qt5-qtserialbus qt5-qtwebengine qt5            |
  -qtwebengine-docs qt5-qtwebkit qt5-qtwebkit-   |
  docs qt5-qtwebview qt5-qtwebview-docs          |
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Comment (by RJVB):

 Was that really necessary?!

 Now dependents ports are going to have to determine what Qt5 port to use
 if they wish to support OS X 10.7 but not require a libc++ enabled OS.
 It might have been more useful to investigate whether C++11 support is
 sufficient in GCC 4.7+ to build at least QtWebKit on 10.7 .

 I also hope to get an answer on my suggestion to split off QtWebEngine. It
 may no longer be necessary to turn that split-off into a multi-versioned
 port with 10.7 in mind, but it will likely require special treatment of
 10.9 sooner than we'd like.

 The lack of versioned dependencies in MacPorts would make it really
 cumbersome to manage multiple Qt5 ports for different 5.x versions in
 addition to qt5-kde in a way that is transparent enough that other port
 maintainers will actually consider using them.

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Ticket URL: <https://trac.macports.org/ticket/52922#comment:4>
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