[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):

 This only changes the build `if {${configure.sdkroot} ne "/"}` ... Are you
 actually building against an SDK and it was working before?

 What is ${configure.sdkroot} evaluating to for you?  I wonder if I misread
 things and it's an empty string in some cases.

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Ticket URL: <https://trac.macports.org/ticket/53726#comment:5>
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