[MacPorts] #37184: digikam @2.9.0_0 Build error

[MacPorts]

#37184: digikam @2.9.0_0 Build error
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  Reporter:  legendre17@…  |      Owner:  jan@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.2
Resolution:                |   Keywords:
      Port:  digikam       |
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Comment (by raimue@…):

 In this case add at least an explanation that clang failed on the CV_XADD
 macro and add a reference to this ticket. This will make it easier to
 verify the correct compilation with clang later.

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Ticket URL: <https://trac.macports.org/ticket/37184#comment:5>
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