[MacPorts] #64826: xar @1.8.0.482: fatal error: 'os/availability.h' file not found

[MacPorts]

#64826: xar @1.8.0.482: fatal error: 'os/availability.h' file not found
-------------------------+-------------------------------------------------
  Reporter:  ryandesign  |      Owner:  Schamschula
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:  tiger leopard snowleopard lion
      Port:  xar         |  mountainlion mavericks yosemite elcapitan
-------------------------+-------------------------------------------------

Comment (by ryandesign):

 The only place this is included is in xar.h.in
 {{{
 #ifdef __APPLE__
 #import <os/availability.h>
 #else
 #define API_DEPRECATED(...)
 #endif
 }}}
 Maybe instead it could be something like (untested):
 {{{
 #ifdef __APPLE__
 #include <AvailabilityMacros.h>
 #endif
 #if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED >= 101200
 #import <os/availability.h>
 #else
 #define API_DEPRECATED(...)
 #endif
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64826#comment:1>
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