[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 sambthompson):

 Replying to [comment:2 ryandesign]:
 > The place to report the issue would be
 https://github.com/c-ares/c-ares/issues

 OK, there might be some other weirdness going on here. It appears c-ares
 (now) has a minimum OS version of 10.12, but the configure test isn't
 failing as it should (there's a related upstream issue
 https://github.com/c-ares/c-ares/issues/454). That's probably the issue to
 report upstream, possibly to re-open upstream 454.

 However, if MacPorts can't/won't do a work-around like for xar, then I
 think the port file also needs adjustment to limit El Capitan and earlier
 to c-ares 1.28.1?

 It's a bit odd since upstream also implemented a fix in their issue 672
 (https://github.com/c-ares/c-ares/issues/672) which applies to OS versions
 < 10.9.

-- 
Ticket URL: <https://trac.macports.org/ticket/70207#comment:3>
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