[MacPorts] #66797: xcbuild fails to configure on 10.6.8

[MacPorts]

#66797: xcbuild fails to configure on 10.6.8
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  (none)
  barracuda156           |
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.0
Resolution:              |   Keywords:  powerpc, leopard, snowleopard,
      Port:  xcbuild     |  rosetta
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Comment (by ryandesign):

 The Image I/O framework was introduced in OS X 10.8.

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Ticket URL: <https://trac.macports.org/ticket/66797#comment:1>
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