[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:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  libsdl2  |
----------------------+----------------------

Comment (by kencu):

 “ Please note that building SDL requires at least Xcode 6 and the 10.9
 SDK. PowerPC support for macOS has been officially dropped as of SDL
 2.0.2. 32-bit Intel and macOS 10.8 runtime support has been officially
 dropped as of SDL 2.24.0.”

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Ticket URL: <https://trac.macports.org/ticket/67666#comment:2>
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