[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
-------------------------+-------------------------------------------------
  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
-------------------------+-------------------------------------------------

Comment (by tobypeterson):

 Looks like they added the <fcntl.h> include upstream. For
 <os/availability.h>, it looks like they simply copied from an Apple open
 source header. I think you may be able to make progress if you delete that
 include and the API_AVAILABLE attributes. Looks like you can also delete
 the _dns_configuration_ack declaration, it isn't used.

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Ticket URL: <https://trac.macports.org/ticket/70207#comment:8>
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