[MacPorts] #61081: unison @2.51.2_3+aqua installed on macOS Mojave (10.14) built for macOS Catalina (10.15) and won't run

[MacPorts]

#61081: unison @2.51.2_3+aqua installed on macOS Mojave (10.14)  built for macOS
Catalina (10.15) and won't run
--------------------------+--------------------
 Reporter:  ShadSterling  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.3
 Keywords:                |       Port:  unison
--------------------------+--------------------
 Invoking the executable inside the app bundle yields an OS version error:

 {{{
 $ /Applications/MacPorts/Unison.app/Contents/MacOS/Unison
 application requires at least OS X version 10.15.0 (10.15), but is being
 run on 10.14.6 ( 10.14.6/18G6020), and so is exiting.Abort trap: 6
 }}}

 (Invoking the executable directly for reasons in #61060)

 How can I tell MacPorts to build Unison for the OS it's running on?

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Ticket URL: <https://trac.macports.org/ticket/61081>
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