[MacPorts] #69435: c4core is broken on Mojave and below

[MacPorts]

#69435: c4core is broken on Mojave and below
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  herbygillot
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.1
Resolution:              |   Keywords:  mojave, highsierra, sierra,
                         |  elcapitan, yosemite, mavericks, mountainlion,
      Port:  c4core      |  lion, snowleopard, leopard, tiger
-------------------------+-------------------------------------------------

Comment (by barracuda156):

 But only with Clang; with GCC it builds just fine.

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Ticket URL: <https://trac.macports.org/ticket/69435#comment:2>
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