[MacPorts] #68592: libical fails to build with gcc on 10.6.8 x86_64: error: expected identifier before '__is_convertible'

[MacPorts]

#68592: libical fails to build with gcc on 10.6.8 x86_64: error: expected
identifier before '__is_convertible'
---------------------------+---------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  snowleopard, x86_64
      Port:  libical       |
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Comment (by barracuda156):

 Here is the answer: https://github.com/iains/gcc-13-branch/issues/12

 It is indeed broken at the moment, regardless of arch.

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Ticket URL: <https://trac.macports.org/ticket/68592#comment:2>
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