[MacPorts] #60281: Error: Failed to configure clang-3.7: llvm-3.7 must be installed without +assertions.

[MacPorts]

#60281: Error: Failed to configure clang-3.7: llvm-3.7 must be installed without
+assertions.
---------------------------------+--------------------
  Reporter:  dbl001              |      Owner:  (none)
      Type:  defect              |     Status:  closed
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.6.2
Resolution:  invalid             |   Keywords:
      Port:  llvm-3.7 clang-3.7  |
---------------------------------+--------------------

Comment (by kencu):

 No - this error has been coming up lately. There is another ticket that
 explored this #60196, and before that, another ticket #59157. I thought I
 had fixed this, following the advice of @ionic, but I guess not.

 It has something to do with the way base changed to no longer need a full
 installation of Xcode, but instead can (sometimes) use the command-line
 tools.

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Ticket URL: <https://trac.macports.org/ticket/60281#comment:4>
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