[MacPorts] #71682: boost187: build fails for 10.10 and earlier: missing TARGET_OS_IOS

[MacPorts]

#71682: boost187: build fails for 10.10 and earlier: missing TARGET_OS_IOS
-----------------------+----------------------
  Reporter:  mascguy   |      Owner:  mascguy
      Type:  defect    |     Status:  reopened
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.10.5
Resolution:            |   Keywords:
      Port:  boost187  |
-----------------------+----------------------

Comment (by barracuda156):

 Yeah, it fails now:
 {{{
 > g++ -x c++ -std=c++11 -pthread -O2 -s -DNDEBUG bindjam.cpp builtins.cpp
 class.cpp command.cpp compile.cpp constants.cpp cwd.cpp debug.cpp
 debugger.cpp events.cpp execcmd.cpp execnt.cpp execunix.cpp filent.cpp
 filesys.cpp fileunix.cpp frames.cpp function.cpp glob.cpp hash.cpp
 hcache.cpp hdrmacro.cpp headers.cpp jam_strings.cpp jam.cpp jamgram.cpp
 lists.cpp make.cpp make1.cpp md5.cpp mem.cpp modules.cpp native.cpp
 option.cpp output.cpp parse.cpp pathnt.cpp pathsys.cpp pathunix.cpp
 regexp.cpp rules.cpp scan.cpp search.cpp startup.cpp tasks.cpp
 timestamp.cpp value.cpp variable.cpp w32_getreg.cpp mod_command_db.cpp
 mod_db.cpp mod_jam_builtin.cpp mod_jam_class.cpp mod_jam_errors.cpp
 mod_jam_modules.cpp mod_order.cpp mod_path.cpp mod_property_set.cpp
 mod_regex.cpp mod_sequence.cpp mod_set.cpp mod_string.cpp mod_summary.cpp
 mod_sysinfo.cpp mod_version.cpp -o b2
 ld: warning: option -s is obsolete and being ignored
 Undefined symbols:
   "_clock_gettime", referenced from:
       __Z17timestamp_currentP9timestamp in ccr6sh1A.o
 ld: symbol(s) not found
 collect2: error: ld returned 1 exit status

 Failed to build B2 build engine
 }}}

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Ticket URL: <https://trac.macports.org/ticket/71682#comment:3>
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