[MacPorts] #60671: ispc-clang: use of undeclared identifier 'MAP_ANONYMOUS', 'CLOCK_MONOTONIC', 'CLOCK_REALTIME', 'clock_gettime'

[MacPorts]

#60671: ispc-clang: use of undeclared identifier 'MAP_ANONYMOUS',
'CLOCK_MONOTONIC', 'CLOCK_REALTIME', 'clock_gettime'
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  tenomoto
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:  yosemite
      Port:  ispc-clang  |
-------------------------+----------------------

Comment (by tenomoto):

 Thanks for pointing me to `llvm-10`. Should I make a copies for some of
 the patches?

 I copied the part turning off features depending on `${os.major}`, but I
 get an error due to conflicting types for `getattrlistat`, same as
 [https://trac.macports.org/ticket/60481 #60481 ], on Yosemite. I don't see
 how you fixed the conflict.  `legacysupport.newest_darwin_requires_legacy
 15` didn't help.

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Ticket URL: <https://trac.macports.org/ticket/60671#comment:3>
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