[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:11 barracuda156]:
 > The build ''is'' fixed, but unfortunately it is unusable at the moment,
 at least with `curl`.
 I think partially. The further set of issues for earlier OSes, covered in
 #70208 (c-ares issues 782/784) may be the remainder.

 >
 > I will work with upstream to have it fixed.
 >
 > Could someone try it on an x86 < 10.12 system?
 > For me `git` fetch fails if `curl` is built as `+ares` with `c-ares`
 1.30.0 (and a patch from upstream). Activating 1.28.1 fixes it. `curl`
 with no `c-ares` also works normally.
 Having rebuilt `curl` with `+ares` (after having successfully built
 `c-ares` 1.30.0 (with patch for older include file) on 10.11, it seems to
 work (unless reverting to the even earlier apple header broke it again).

-- 
Ticket URL: <https://trac.macports.org/ticket/70207#comment:12>
MacPorts <https://www.macports.org/>
Ports system for macOS