[MacPorts] #49299: akonadi build fails after qt4-mac update

[MacPorts]

#49299: akonadi build fails after qt4-mac update
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  Reporter:  jwhowse4@…  |      Owner:  nicos@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  akonadi     |
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Comment (by nicos@…):

 Thanks for having looked at that, I would have probably been slightly
 lost.

 If I follow correctly, your patch is overriding the behaviour of the cxx11
 portgroup in case of using libstdc++ to enable compilation anyway. Could
 not this lead to issues with runtime dependencies? Akonadi is then
 potentially used by several ports, in particular KDE ones.

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Ticket URL: <https://trac.macports.org/ticket/49299#comment:11>
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