[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:  judaew
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  pandoc      |
-------------------------+----------------------

Comment (by kencu):

 {{{
 :info:build pandoc-cli                       > Undefined symbols for
 architecture x86_64:
 :info:build pandoc-cli                       >   "_iconv_close",
 referenced from:
 :info:build pandoc-cli                       >       _hs_iconv_close in
 libHSbase-4.16.4.0.a(iconv.o)
 :info:build pandoc-cli                       >      (maybe you meant:
 _hs_iconv_close)
 :info:build pandoc-cli                       >   "_iconv", referenced
 from:
 :info:build pandoc-cli                       >       _hs_iconv in
 libHSbase-4.16.4.0.a(iconv.o)
 :info:build pandoc-cli                       >      (maybe you meant:
 _base_GHCziIOziEncodingziIconv_iconvEncoding13_closure,
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66764#comment:5>
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