[MacPorts] #59341: compiling cmake fails on High Sierra: tries to build universal against the 10.14 SDK on 10.13

[MacPorts]

#59341: compiling cmake fails on High Sierra: tries to build universal against the
10.14 SDK on 10.13
--------------------------+-----------------------
  Reporter:  freemanbach  |      Owner:  michaelld
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.1
Resolution:               |   Keywords:
      Port:  cmake        |
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Comment (by ryandesign):

 The log shows you have Xcode 10.1. Xcode 10.x only has the macOS 10.14
 SDK, which doesn't have 32-bit parts. If you want to build 32-bit,
 downgrade to Xcode 9 and the corresponding version of the command line
 tools to get the 10.13 SDK which still has 32-bit parts.

 Or, don't try to build universal.

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Ticket URL: <https://trac.macports.org/ticket/59341#comment:3>
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