[MacPorts] #39605: clang-3.3: upgrade failure on 10.6 - Availability.h not found

[MacPorts]

#39605: clang-3.3: upgrade failure on 10.6 - Availability.h not found
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  Reporter:  david.w.watson@…  |      Owner:  jeremyhu@…
      Type:  defect            |     Status:  closed
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.1.3
Resolution:  invalid           |   Keywords:
      Port:  clang-3.3         |
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Comment (by jeremyhu@…):

 Well I'm not hitting this on any of my machines.  This is almost certainly
 a configuration error.  If you don't think so, please provide a reduced
 case showing the bug.

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Ticket URL: <https://trac.macports.org/ticket/39605#comment:10>
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