[MacPorts] #56901: clang-6.0 configure failure

[MacPorts]

#56901: clang-6.0 configure failure
------------------------+----------------------
  Reporter:  dkbarto    |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.3
Resolution:             |   Keywords:
      Port:  clang-6.0  |
------------------------+----------------------

Comment (by mf2k):

 It would be deleted if you {{{clean}}} the port. You can locate it as
 follows:

 {{{
 port logfile i3
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56901#comment:4>
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