[MacPorts] #64836: ghc build error on arm: 'ffitarget_arm64.h' file not found

[MacPorts]

#64836: ghc build error on arm: 'ffitarget_arm64.h' file not found
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  Reporter:  essandess  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  ghc        |
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Comment (by jmroot):

 It looks like ghc includes its own copy of libffi, which doesn't include
 the right files to work on arm64. Either that needs to be fixed, or an
 external libffi needs to be used. Mixing and matching files from different
 versions won't end well.

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Ticket URL: <https://trac.macports.org/ticket/64836#comment:4>
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