[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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Changes (by mascguy):

 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 Ah, it looks like the bootstrap process - which builds engine `b2` - may
 not be respecting `ld`-related flags. This results in undefined symbols
 for items provided by `legacysupport`, including `clock_gettime`.

 Should be fairly simple to patch though.

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Ticket URL: <https://trac.macports.org/ticket/71682#comment:2>
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