[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)
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  Reporter:  jeremyhu  |      Owner:  jeremyhu
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  libgcc    |
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Comment (by jeremyhu):

 I suspected that this should work if I pass --with-build-sysroot=... to
 configure, but I still hit the same issue.  I think that's likely an issue
 that upstream needs to fix, since it should be looking in the sysroot for
 /usr/include.

 See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79885

 Looking at gcc-4.2, I think this should work if I add
 SYSTEM_HEADER_DIR="${configure.sdkroot}/usr/include" to build.args, so
 giving that a try next...

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Ticket URL: <https://trac.macports.org/ticket/53726#comment:2>
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