[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
Resolution:                |   Keywords:
      Port:  unison        |
---------------------------+--------------------

Comment (by ryandesign):

 Ok, I do see
 {{{
 export MACOSX_DEPLOYMENT_TARGET=10.15
 }}}
 in that log, which explains the problem, but I don't yet know where that
 comes from (it's not in the source code). The source code (in the Xcode
 project) sets MACOSX_DEPLOYMENT_TARGET=10.6, and we add a patch which
 removes that. We do similar things in other ports with the intention that
 it would use the deployment target that MacPorts sets globally. Maybe that
 no longer works with the "new build system" introduced in Xcode 10.

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Ticket URL: <https://trac.macports.org/ticket/61081#comment:2>
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