[MacPorts] #48471: FSF gcc48 fails to compile projects on El Capitan due to OS X SDK bug in Availability.h

[MacPorts]

#48471: FSF gcc48 fails to compile projects on El Capitan due to OS X SDK bug in
Availability.h
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  Reporter:  jasonw@…  |      Owner:  mww@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:  elcapitan
      Port:  gcc48     |
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Comment (by jeremyhu@…):

 Yes.  If you want, you can just manually edit Availability.h to replace
 the 'defined(__has_feature)' with 'defined(__has_attribute)' for the OSX
 and iOS availability macros.

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Ticket URL: <https://trac.macports.org/ticket/48471#comment:41>
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