[MacPorts] #67666: libsdl2: builds fail for 10.7/10.8: error: no visible @interface for 'NSAlert' declares the selector 'beginSheetModalForWindow:completionHandler

[MacPorts]

#67666: libsdl2: builds fail for 10.7/10.8: error: no visible @interface for
'NSAlert' declares the selector 'beginSheetModalForWindow:completionHandler
----------------------+--------------------
  Reporter:  mascguy  |      Owner:  jmroot
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:  fixed    |   Keywords:
      Port:  libsdl2  |
----------------------+--------------------

Comment (by jmroot):

 https://github.com/libsdl-org/SDL/pull/11827

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Ticket URL: <https://trac.macports.org/ticket/67666#comment:10>
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