[MacPorts] #69076: git-annex port fails with GHC error

[MacPorts]

#69076: git-annex port fails with GHC error
------------------------+--------------------
  Reporter:  Jaharmi    |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:
      Port:  git-annex  |
------------------------+--------------------

Comment (by Jaharmi):

 The error:

 {{{
 Warning: Couldn't figure out LLVM version!
 }}}

 appears related to GHC 8.10.7 vs 9.x, per [[https://github.com/haskell
 /vscode-haskell/issues/667|GitHub issue #667]].

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Ticket URL: <https://trac.macports.org/ticket/69076#comment:2>
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