[MacPorts] #57474: bladeRF @20181024_1 fails to build on Mavericks

[MacPorts]

#57474: bladeRF @20181024_1 fails to build on Mavericks
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  Reporter:  tehcog   |      Owner:  michaelld
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.5.4
Resolution:           |   Keywords:  legacysupport
      Port:  bladeRF  |
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Comment (by jmroot):

 So, `clockid_t` and `clock_id_t` are indeed completely different types.
 The former is (at least on High Sierra) declared in `time.h` and is
 specified by posix. The latter is a Mach thing.

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Ticket URL: <https://trac.macports.org/ticket/57474#comment:5>
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