[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 murrayeisenberg@…):

 Replying to [comment:78 siqueira@…]:
 > I just tried copy and pasting Availability.h as suggested by
 michaelbyrne1978 at gmal.com, and this doesn't seem to work. Iit wants me to
 turn of SIP which I would rather not do.
 Did you try the workaround of copying Availability.h into
 /opt/local/include and doing the edits in the copy.? As I noted in another
 reply, that worked for me.

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Ticket URL: <https://trac.macports.org/ticket/48471#comment:80>
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