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

[MacPorts]

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

Comment (by kencu):

 adding this at least gets us bootstrapped. Probably best to wrap it in a
 10.7-10.8 specific block:
 {{{
 configure.cxxflags-append -D_DARWIN_C_SOURCE
 }}}
 rest of the build ongoing...

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Ticket URL: <https://trac.macports.org/ticket/60885#comment:17>
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