[MacPorts] #62572: unison 2.51.2 build error on Catalina 10.15.6, MacPorts 2.6.4 clean install

[MacPorts]

#62572: unison 2.51.2 build error on Catalina 10.15.6, MacPorts 2.6.4 clean install
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  Reporter:  trebitzki  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  unison     |
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Comment (by trebitzki):

 Thanks for your help Kencu! How can I resolve the issue? Should I
 reinstall ocaml? I have no idea how MacPorts works, I'm just a user...

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Ticket URL: <https://trac.macports.org/ticket/62572#comment:3>
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