[MacPorts] #58199: cmake: build failure on OSX 10.11 due to LegacySupport PortGroup

[MacPorts]

#58199: cmake: build failure on OSX 10.11 due to LegacySupport PortGroup
---------------------+-----------------------
  Reporter:  dbl001  |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.4
Resolution:          |   Keywords:
      Port:  cmake   |
---------------------+-----------------------

Comment (by cjones051073):

 i.e., based on what is in 10.12+ time.h, something like

 {{{

 typedef enum {
 _CLOCK_REALTIME __CLOCK_AVAILABILITY = 0,
 #ifndef CLOCK_REALTIME
 # define CLOCK_REALTIME _CLOCK_REALTIME
 #endif
 _CLOCK_MONOTONIC __CLOCK_AVAILABILITY = 6,
 #ifndef CLOCK_MONOTONIC
 # define CLOCK_MONOTONIC _CLOCK_MONOTONIC
 #endif
 } clockid_t;

 }}}

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Ticket URL: <https://trac.macports.org/ticket/58199#comment:17>
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