[MacPorts] #56994: vim-8.1.0280 does not build under OS X 10.5.8

[MacPorts]

#56994: vim-8.1.0280 does not build under OS X 10.5.8
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  Reporter:  josephsacco  |      Owner:  raimue
      Type:  defect       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.3
Resolution:  fixed        |   Keywords:  leopard legacy-os
      Port:  vim          |
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Comment (by udbraumann):

 You are great, Ken, thanks a lot! To be precise, your patch fixes the test
 for some SDK newer than 10.5.

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Ticket URL: <https://trac.macports.org/ticket/56994#comment:12>
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