[MacPorts] #59938: clang-3.7 +universal: Undefined symbols for architecture i386

[MacPorts]

#59938: clang-3.7 +universal: Undefined symbols for architecture i386
------------------------------+--------------------
  Reporter:  TheLastLovemark  |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.2
Resolution:                   |   Keywords:
      Port:  clang-3.7        |
------------------------------+--------------------

Comment (by kencu):

 you will need to add the MacOS10.13.sdk in both places.

 You would do well to find it in an Apple location, such as the Xcode9 CLTs
 from their dev downloads website.

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Ticket URL: <https://trac.macports.org/ticket/59938#comment:6>
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