[MacPorts] #64597: libusb @ 1.0.25: error: use of undeclared identifier 'CLOCK_MONOTONIC'; error: 'TARGET_OS_OSX' is not defined, evaluates to 0; 'clock_gettime' is invalid in C99

[MacPorts]

#64597: libusb @ 1.0.25: error: use of undeclared identifier 'CLOCK_MONOTONIC';
error: 'TARGET_OS_OSX' is not defined, evaluates to 0; 'clock_gettime' is
invalid in C99
-----------------------+---------------------------------
  Reporter:  thetrial  |      Owner:  michaelld
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:  elcapitan legacy-os
      Port:  libusb    |
-----------------------+---------------------------------

Comment (by RobK88):

 FYI -- I am also unable to build libusb @ 1.0.25 on Lion.  Use of
 undeclared identifier 'CLOCK_MONOTONIC'
 But I do not see the other error -- error: 'TARGET_OS_OSX' is not defined

 See attached main.log

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Ticket URL: <https://trac.macports.org/ticket/64597#comment:2>
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