[MacPorts] #52258: cmake upgrade to 3.6.2_0 fails

[MacPorts]

#52258: cmake upgrade to 3.6.2_0 fails
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  Reporter:  dersh@…  |      Owner:  michaelld@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.4
Resolution:           |   Keywords:
      Port:  cmake    |
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Comment (by ryandesign@…):

 Replying to [comment:8 michaelld@…]:
 > The basic issue is that we need to set the SDK properly by the host OS.
 In your case here, the build is trying to use the 10.12 SDK while you're
 running on 10.11. That's asking for problems. I'm not sure what the
 correct solution is off the top of my head.

 It's not asking for problems; it's the way things are on macOS now, and
 have been already for awhile. If cmake doesn't like it, cmake is wrong.
 @jeremyhu had some more info on that point on the mailing list.

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Ticket URL: <https://trac.macports.org/ticket/52258#comment:18>
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