[MacPorts] #66764: pandoc @3.0: build fails on Mac OS < 11

[MacPorts]

#66764: pandoc @3.0: build fails on Mac OS < 11
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  Reporter:  someuser12  |      Owner:  judaew
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  pandoc      |
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Comment (by essandess):

 Based on https://ports.macports.org/port/stack/details/ , I set
 {{{stack}}} to be the default build tool on older systems because it
 appeared to successfully built Haskell projects more reliably than
 {{{cabal}}}. This, apparently, is incorrect. I’ll set it back to
 {{{cabal}}} and issue a PR.

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Ticket URL: <https://trac.macports.org/ticket/66764#comment:9>
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