[MacPorts] #71682: boost187: build fails for 10.10 and earlier: missing TARGET_OS_IOS

[MacPorts]

#71682: boost187: build fails for 10.10 and earlier: missing TARGET_OS_IOS
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  Reporter:  mascguy   |      Owner:  mascguy
      Type:  defect    |     Status:  reopened
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.10.5
Resolution:            |   Keywords:
      Port:  boost187  |
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Comment (by BjarneDMat):

 https://github.com/macports/macports-ports/pull/28665

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Ticket URL: <https://trac.macports.org/ticket/71682#comment:4>
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