[MacPorts] #60885: Unable to build cmake on Lion

[MacPorts]

#60885: Unable to build cmake on Lion
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  Reporter:  RobK88  |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.3
Resolution:          |   Keywords:
      Port:  cmake   |
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Comment (by kencu):

 for lion, I'm wondering if {{{__DARWIN_C_SOURCE}}} is not defined for the
 build, but needs to be set.

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Ticket URL: <https://trac.macports.org/ticket/60885#comment:13>
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