[MacPorts] #59078: poppler @0.80.0 build fails with Xcode 11.0

[MacPorts]

#59078: poppler @0.80.0 build fails with Xcode 11.0
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  Reporter:  mndavidoff                     |      Owner:  dbevans
      Type:  defect                         |     Status:  assigned
  Priority:  Normal                         |  Milestone:
 Component:  ports                          |    Version:
Resolution:                                 |   Keywords:  xcode11
      Port:  poppler gobject-introspection  |
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Comment (by jmroot):

 There is <https://github.com/macports/macports-base/pull/147> which sets
 SDKROOT globally in the environment but I don't know if it helps in the
 case where a nonexistent -isysroot path was given on the command line.

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Ticket URL: <https://trac.macports.org/ticket/59078#comment:23>
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