[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 kencu):

 Depending on how motivated anyone is to get this particular port to build
 on older systems, you'd have to basically duplicate what I have done in
 the {{{llvm-10}}} portfile to get all the older systems working. It's not
 over hard, now that we know what is needed -- copy/paste and turn various
 features off, depending the on the system.

 There used to be another option available -- to use the existing llvm
 ports, and just build them with +debug enabled (ipsc uses features only in
 the debug build). but that option was removed not long ago in favour of
 this, for buildbot reasons (we didn't want the default llvm build to have
 all the +debug stuff in it).

-- 
Ticket URL: <https://trac.macports.org/ticket/60671#comment:1>
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