[MacPorts] #63808: GitUp @1.1.3: error: use of undeclared identifier 'NSBackgroundStyleEmphasized'

[MacPorts]

#63808: GitUp @1.1.3: error: use of undeclared identifier
'NSBackgroundStyleEmphasized'
-------------------------+------------------------
  Reporter:  ryandesign  |      Owner:  Knapoc
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.99
Resolution:              |   Keywords:  highsierra
      Port:  GitUp       |
-------------------------+------------------------

Comment (by ryandesign):

 That would be fine, just make the port exit early and print a helpful
 message (and set `known_fail yes`) on OS versions where it will not build;
 see other ports for examples.

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Ticket URL: <https://trac.macports.org/ticket/63808#comment:2>
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