[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
-------------------------------+-------------------------
  Reporter:  david.w.watson@…  |      Owner:  jeremyhu@…
      Type:  defect            |     Status:  closed
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.1.3
Resolution:  invalid           |   Keywords:  snowleopard
      Port:  clang-3.3         |
-------------------------------+-------------------------

Comment (by david.w.watson@…):

 Availability does exist in my /usr/include, but my setup kept clang from
 finding it. An install of CarbonHeaders allowed clang to install.

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Ticket URL: <https://trac.macports.org/ticket/39605#comment:4>
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