[MacPorts] #53996: ostinato @0.8 fails to build with libc++

[MacPorts]

#53996: ostinato @0.8 fails to build with libc++
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  Reporter:  1-61803   |      Owner:  g5pw
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  ostinato  |
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Comment (by kencu):

 In the log above, the build is still using `/usr/bin/clang`, and it's not
 building with clang-3.9 w libc++. qt4 caches it's build info into some
 convoluted configuration files (and more than one, to make it trickier). I
 can recall needing to change these by hand when I changed compilers from
 clang-3.7 to clang-3.8, but maybe there's an easier way.

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Ticket URL: <https://trac.macports.org/ticket/53996#comment:3>
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