[MacPorts] #70207: c-ares @1.30.0_0: fatal error: 'os/availability.h' file not found

[MacPorts]

#70207: c-ares @1.30.0_0: fatal error: 'os/availability.h' file not found
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  Reporter:              |      Owner:  tobypeterson
  sambthompson           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.3
Resolution:              |   Keywords:  mountainlion mavericks yosemite
      Port:  c-ares      |  elcapitan
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Comment (by ryandesign):

 Replying to [ticket:70207 sambthompson]:
 > OS versions prior (Lion/Snow Leopard) buildbot logs show different
 errors, not investigated.

 I filed https://github.com/c-ares/c-ares/issues/782 for that.

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Ticket URL: <https://trac.macports.org/ticket/70207#comment:5>
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