[MacPorts] #44129: cmake: fix build against libc++ on Lion

[MacPorts]

#44129: cmake: fix build against libc++ on Lion
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  Reporter:  mojca@…  |      Owner:  michaelld@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  lion
      Port:  cmake    |
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Comment (by michaelld@…):

 I attached a test .cc file, Mojca's modified to print out whether the
 gcount is OK or NOT OK. Simple to compile & execute.

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Ticket URL: <https://trac.macports.org/ticket/44129#comment:19>
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