[MacPorts] #59113: gcc: cannot find systems headers with Xcode 11

[MacPorts]

#59113: gcc: cannot find systems headers with Xcode 11
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  Reporter:  abyrvalk        |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  gcc7 gcc8 gcc9  |
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Comment (by kencu):

 TBH, they couldn't know that MacPorts would hard code the path to
 "MacOSX10.14.sdk" in 10,000 places...

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Ticket URL: <https://trac.macports.org/ticket/59113#comment:26>
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