[MacPorts] #53726: libgcc / gcc fails to build against SDK (i.e. without system headers installed)

[MacPorts]

#53726: libgcc / gcc fails to build against SDK (i.e. without system headers
installed)
-----------------------+----------------------
  Reporter:  jeremyhu  |      Owner:  jeremyhu
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  libgcc    |
-----------------------+----------------------

Comment (by jeremyhu):

 I'll do my best to try and figure this out, but it's likely to not get
 fixed unless someone who is able to read GPLv3 code can fix the broken
 build.

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Ticket URL: <https://trac.macports.org/ticket/53726#comment:1>
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