[MacPorts] #39605: clang-3.3 fails to upgrade - Availability.h not found

[MacPorts]

#39605: clang-3.3 fails to upgrade - Availability.h not found
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  Reporter:  david.w.watson@…  |      Owner:  macports-tickets@…
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.1.3
Resolution:                    |   Keywords:
      Port:  clang-3.3         |
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Comment (by egall@…):

 The CarbonHeaders port contains an Availability.h header; try installing
 that.

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Ticket URL: <https://trac.macports.org/ticket/39605#comment:1>
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