[MacPorts] #59464: building gcc 9 fails

[MacPorts]

#59464: building gcc 9 fails
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  Reporter:  lplatter  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.1
Resolution:            |   Keywords:
      Port:  gcc9      |
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Comment (by ryandesign):

 I see that you're using cctools with the +llvm80 variant. The cctools port
 only provides the Xcode 10 version. Since you're using Xcode 11, that
 might not be compatible. Try reinstalling the cctools port with the +xcode
 variant.

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Ticket URL: <https://trac.macports.org/ticket/59464#comment:5>
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