[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
----------------------------+--------------------
  Reporter:  trebitzki      |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.4
Resolution:                 |   Keywords:
      Port:  unison 2.51.2  |
----------------------------+--------------------
Changes (by trebitzki):

 * Attachment "unison.log" added.

 main.log for the unison installtion

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