[MacPorts] #63663: gegl-0.3 @0.3.34_10: Undefined Exiv2 symbols

[MacPorts]

#63663: gegl-0.3 @0.3.34_10: Undefined Exiv2 symbols
-------------------------+----------------------
  Reporter:  evanmiller  |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  gegl-0.3    |
-------------------------+----------------------

Comment (by evanmiller):

 Good news - build succeeds with {{{compiler.cxx_standard 2011}}} – which I
 guess juggles the libc++ interfaces behind the scenes? Will prep a PR
 later.

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Ticket URL: <https://trac.macports.org/ticket/63663#comment:5>
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