[MacPorts] #66764: pandoc @3.0: build fails on Mac OS < 10.16

[MacPorts]

#66764: pandoc @3.0: build fails on Mac OS < 10.16
------------------------+--------------------
 Reporter:  someuser12  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:
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 pandoc @3.0 fails building on Mac OS < 10.16 (the port health on the
 MacPorts buildbots is here:
 https://ports.macports.org/port/pandoc/details/). Please find an attached
 log.

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