[MacPorts] #53078: openmpi-llvm fails to configure

[MacPorts]

#53078: openmpi-llvm fails to configure
---------------------------+------------------------
  Reporter:  ksze          |      Owner:  seanfarley
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.5
Resolution:                |   Keywords:
      Port:  openmpi-llvm  |
---------------------------+------------------------

Comment (by ksze):

 But I *do* have the command line tools installed, at least according to
 App Store.

 I have "Command Line Tools (macOS Sierra version 10.12) for Xcode", which
 I installed as an App Store update on December 14th. Xcode was also
 updated to 8.2 on the same day.

 I have already agreed to the license with `sudo xcodebuild -license` since
 the new Xcode and command line tools were installed.

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Ticket URL: <https://trac.macports.org/ticket/53078#comment:3>
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