[MacPorts] #49375: unable to upgrade clang-3.4

[MacPorts]

#49375: unable to upgrade clang-3.4
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  Reporter:  p.fabrizio.salvatore@…  |      Owner:  jeremyhu@…
      Type:  defect                  |     Status:  new
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.3.4
Resolution:                          |   Keywords:
      Port:  clang-3.4               |
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Comment (by dstrubbe@…):

 I would clean and re-try; maybe you had some leftovers from a build of
 clang 3.4 with the previous OS?

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Ticket URL: <https://trac.macports.org/ticket/49375#comment:3>
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