[MacPorts] #56679: poppler @0.65.0: error: use of undeclared identifier 'nullptr'

[MacPorts]

#56679: poppler @0.65.0: error: use of undeclared identifier 'nullptr'
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  Reporter:  ryandesign  |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  poppler     |
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Comment (by ryandesign):

 One reason might be that clang 5 and earlier defaulted to `-std=gnu++98`
 while clang 6 and later default to `-std=gnu++14`.

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Ticket URL: <https://trac.macports.org/ticket/56679#comment:2>
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