[tor-bugs] #26876 [Core Tor/Tor]: tor.real fails to start on macOS 10.9

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#26876: tor.real fails to start on macOS 10.9
-------------------------------------------------+-------------------------
 Reporter:  mcs                                  |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.3.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  ff60-esr, tbb-needs, regression,     |  Actual Points:
  fast-fix, 033-backport, 034-backport           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  new => assigned
 * component:  Applications/Tor Browser => Core Tor/Tor
 * owner:  tbb-team => teor
 * version:   => Tor: 0.3.3.1-alpha
 * milestone:   => Tor: 0.3.5.x-final
 * keywords:  ff60-esr => ff60-esr, tbb-needs, regression, fast-fix,
     033-backport, 034-backport


Comment:

 Replying to [comment:1 mcs]:
 > I found #24427 as well as
 https://developer.apple.com/documentation/kernel/1462443-mach_approximate_time
 (which does indicate that mach_approximate_time() is available in macOS
 10.9 and newer).

 Ah, but the macOS 10.9 header doesn't actually have that symbol:
 https://opensource.apple.com/source/xnu/xnu-2422.1.72/osfmk/mach/mach_time.h.auto.html

 In fact, the symbol is only available in the macOS 10.10 header:
 https://opensource.apple.com/source/xnu/xnu-2782.1.97/osfmk/mach/mach_time.h.auto.html

 (The kernel version index is here: https://opensource.apple.com/ )

 So I will do something similar to #20235 here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26876#comment:2>
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