[MacPorts] #51801: qt5: support older versions of OS X via different versions of Qt 5

[MacPorts]

#51801: qt5: support older versions of OS X via different versions of Qt 5
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  Reporter:  davide.liessi@…  |      Owner:  mcalhoun@…
      Type:  enhancement      |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  qt5              |
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Comment (by kenneth.f.cunningham@…):

 Ah. In the qt5-qtbase configure script, there is a section called
 "macSDKify()". This calls
 {{{
 /usr/bin/xcrun -sdk SDK -find clang
 }}}
 and this is what returns /Developer/usr/bin/clang instead of the macports
 version. So this would be the area of attention to try to get that
 function to return /opt/local/bin/clang instead. Although, to be clear,
 it's certainly not yet clear that this version of qt5 will be able to
 ultimately compile on 10.6.8/libc++ even with clang-3.8. The last qt5 that
 officially worked on 10.6.8 was 5.4 I think.

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Ticket URL: <https://trac.macports.org/ticket/51801#comment:3>
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