[MacPorts] #72143: ghc @9.12.1_0: build fails on 10.14.6 with 'error: C preprocessor "/usr/bin/cpp" fails sanity check'

[MacPorts]

#72143: ghc @9.12.1_0: build fails on 10.14.6 with 'error: C preprocessor
"/usr/bin/cpp" fails sanity check'
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  Reporter:  larryv  |      Owner:  essandess
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  ghc     |
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Comment (by ryandesign):

 Do these problems still happen if you [wiki:howto/InstallingOlderPort
 downgrade] legacy-support to 1.3.0?

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Ticket URL: <https://trac.macports.org/ticket/72143#comment:2>
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