[MacPorts] #59679: Unison 2.51.2_2 + aqua doesn't build on MacOS 10.13

[MacPorts]

#59679: Unison 2.51.2_2 + aqua doesn't build on MacOS 10.13
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 Reporter:  brunoomartin     |      Owner:  (none)
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.6.2
 Keywords:  unison 2.51.2_2  |       Port:  unison 2.51.2_2
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 Hi,

 Unison fails to build on 10.13 with aqua flavor. Enclosed is the log file.
 Any hint ?

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Ticket URL: <https://trac.macports.org/ticket/59679>
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