[MacPorts] #53075: zmq @4.2.0 does not build on a PPC running OS X 10.5.8

[MacPorts]

#53075: zmq @4.2.0 does not build on a PPC running OS X 10.5.8
------------------------------+-----------------
 Reporter:  josephsacco       |      Owner:
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:
 Keywords:  leopard, powerpc  |       Port:  zmq
------------------------------+-----------------
 The latest version of zmq does not build on a PPC running leopard. The
 previous version, 4.1.6_0, builds without incident.

 The problem is CLOCK_MONOTONIC is not defined in time.h for OSX 10.5.8[see
 snippet of build output below].

 -Joseph

 src/clock.cpp: In static member function 'static uint64_t
 zmq::clock_t::rdtsc()':
 src/clock.cpp:243:19: error: 'CLOCK_MONOTONIC' was not declared in this
 scope
      clock_gettime(CLOCK_MONOTONIC, &ts);
                    ^~~~~~~~~~~~~~~
 src/clock.cpp:243:39: error: 'clock_gettime' was not declared in this
 scope
      clock_gettime(CLOCK_MONOTONIC, &ts);
                                        ^

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Ticket URL: <https://trac.macports.org/ticket/53075>
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