[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 bernard.j.kelly@…):

 This just happened to me on my Mountain Lion (10.8.4) system.

 I've just installed CarbonHeaders, and that appears to have fixed the
 issue, but I'm wondering why this got flagged as "invalid"? Did earlier
 clang versions not need this header? If an installed port breaks on
 "upgrade outdated" when nothing was (consciously) changed by the user,
 isn't that a real problem?

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Ticket URL: <https://trac.macports.org/ticket/39605#comment:6>
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