kivy-ios: Toolchain build failed on OSX Xcode 8, libffi depends on undefined mkostemp function

Not sure what what is going on here… OSX 10.11.6, Xcode 8.0 (8A218a), using c7624becbd122d991112f37ee01cfa3a9b6a040f

$ ./toolchain.py build kivy
Want to build ['kivy']
Loaded recipe kivy (depends of ['python', 'sdl2', 'sdl2_image', 'sdl2_mixer', 'sdl2_ttf', 'ios'], optional are [])
Loaded recipe python (depends of ['hostpython', 'libffi'], optional are ['openssl'])
Loaded recipe sdl2 (depends of [], optional are [])
Loaded recipe sdl2_image (depends of ['sdl2'], optional are [])
Loaded recipe sdl2_mixer (depends of ['sdl2'], optional are [])
Loaded recipe sdl2_ttf (depends of ['sdl2', 'freetype'], optional are [])
Loaded recipe ios (depends of ['python'], optional are [])
Loaded recipe hostpython (depends of ['hostlibffi'], optional are [])
Loaded recipe libffi (depends of [], optional are [])
Loaded recipe freetype (depends of [], optional are [])
Loaded recipe hostlibffi (depends of [], optional are [])
Build order is ['freetype', 'hostlibffi', 'libffi', 'sdl2', 'hostpython', 'sdl2_image', 'sdl2_mixer', 'sdl2_ttf', 'python', 'ios', 'kivy']
Include dir added: {arch.arch}/freetype
Include dir added: {arch.arch}/hostlibffi
Include dir added: {arch.arch}/libffi
Include dir added: common/sdl2
Global: hostpython located at /Users/Tim/dev/kivy-ios/dist/hostpython/bin/python
Global: hostpgen located at /Users/Tim/dev/kivy-ios/dist/hostpython/bin/pgen
Include dir added: common/sdl2_image
Include dir added: common/sdl2_mixer
Include dir added: common/sdl2_ttf
# (ignored) Download freetype
# (ignored) Extract freetype
# (ignored) Build_all freetype
# (ignored) Download hostlibffi
# (ignored) Extract hostlibffi
Build hostlibffi for x86_64 (filtered)
# (ignored) Build hostlibffi
# (ignored) Download libffi
# (ignored) Extract libffi
# (ignored) Build_all libffi
# (ignored) Download sdl2
# (ignored) Extract sdl2
# (ignored) Build_all sdl2
# (ignored) Download hostpython
# (ignored) Extract hostpython
Build_all hostpython
Build hostpython for x86_64 (filtered)
# (ignored) Build hostpython
Install include files for hostpython
# (ignored) Install_include hostpython
Install frameworks for hostpython
# (ignored) Install_frameworks hostpython
Install sources for hostpython
# (ignored) Install_sources hostpython
Install hostpython
Makefile:1392: warning: overriding commands for target `Modules/posixmodule.o'
Makefile:1284: warning: ignoring old commands for target `Modules/posixmodule.o'
Makefile:1393: warning: overriding commands for target `Modules/posixmodule.so'
Makefile:1285: warning: ignoring old commands for target `Modules/posixmodule.so'
Makefile:1394: warning: overriding commands for target `Modules/errnomodule.o'
Makefile:1286: warning: ignoring old commands for target `Modules/errnomodule.o'
Makefile:1395: warning: overriding commands for target `Modules/errnomodule.so'
Makefile:1287: warning: ignoring old commands for target `Modules/errnomodule.so'
Makefile:1396: warning: overriding commands for target `Modules/pwdmodule.o'
Makefile:1288: warning: ignoring old commands for target `Modules/pwdmodule.o'
Makefile:1397: warning: overriding commands for target `Modules/pwdmodule.so'
Makefile:1289: warning: ignoring old commands for target `Modules/pwdmodule.so'
Makefile:1398: warning: overriding commands for target `Modules/_sre.o'
Makefile:1290: warning: ignoring old commands for target `Modules/_sre.o'
Makefile:1399: warning: overriding commands for target `Modules/_sre.so'
Makefile:1291: warning: ignoring old commands for target `Modules/_sre.so'
Makefile:1400: warning: overriding commands for target `Modules/_codecsmodule.o'
Makefile:1292: warning: ignoring old commands for target `Modules/_codecsmodule.o'
Makefile:1401: warning: overriding commands for target `Modules/_codecsmodule.so'
Makefile:1293: warning: ignoring old commands for target `Modules/_codecsmodule.so'
Makefile:1402: warning: overriding commands for target `Modules/_weakref.o'
Makefile:1310: warning: ignoring old commands for target `Modules/_weakref.o'
Makefile:1403: warning: overriding commands for target `Modules/_weakref.so'
Makefile:1311: warning: ignoring old commands for target `Modules/_weakref.so'
Makefile:1404: warning: overriding commands for target `Modules/zipimport.o'
Makefile:1294: warning: ignoring old commands for target `Modules/zipimport.o'
Makefile:1405: warning: overriding commands for target `Modules/zipimport.so'
Makefile:1295: warning: ignoring old commands for target `Modules/zipimport.so'
Makefile:1406: warning: overriding commands for target `Modules/symtablemodule.o'
Makefile:1296: warning: ignoring old commands for target `Modules/symtablemodule.o'
Makefile:1407: warning: overriding commands for target `Modules/_symtablemodule.so'
Makefile:1297: warning: ignoring old commands for target `Modules/_symtablemodule.so'
Makefile:1408: warning: overriding commands for target `Modules/xxsubtype.o'
Makefile:1353: warning: ignoring old commands for target `Modules/xxsubtype.o'
Makefile:1409: warning: overriding commands for target `Modules/xxsubtype.so'
Makefile:1354: warning: ignoring old commands for target `Modules/xxsubtype.so'
clang -Qunused-arguments -fcolor-diagnostics -lsqlite3 -lffi -L/Users/Tim/dev/kivy-ios/dist/hostlibffi/usr/local/lib  -o python.exe \
            Modules/python.o \
            libpython2.7.a -ldl  -framework CoreFoundation -L/Users/Tim/dev/kivy-ios/dist/hostpython/lib -lz                      
ld: warning: directory not found for option '-L/Users/Tim/dev/kivy-ios/dist/hostpython/lib'
Undefined symbols for architecture x86_64:
  "_mkostemp", referenced from:
      _open_temp_exec_file_dir in libffi.a(closures.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [python.exe] Error 1
Traceback (most recent call last):
  File "./toolchain.py", line 1311, in <module>
    ToolchainCL()
  File "./toolchain.py", line 1082, in __init__
    getattr(self, args.command)()
  File "./toolchain.py", line 1106, in build
    build_recipes(args.recipe, ctx)
  File "./toolchain.py", line 974, in build_recipes
    recipe.execute()
  File "/Users/Tim/dev/kivy-ios/toolchain.py", line 586, in execute
    self.build_all()
  File "/Users/Tim/dev/kivy-ios/toolchain.py", line 56, in _cache_execution
    f(self, *args, **kwargs)
  File "/Users/Tim/dev/kivy-ios/toolchain.py", line 698, in build_all
    self.install()
  File "/Users/Tim/dev/kivy-ios/recipes/hostpython/__init__.py", line 86, in install
    _env=build_env)
  File "/Users/Tim/dev/kivy-ios/toolchain.py", line 39, in shprint
    for line in command(*args, **kwargs):
  File "./tools/external/sh.py", line 565, in next
    self.wait()
  File "./tools/external/sh.py", line 500, in wait
    self.handle_command_exit_code(exit_code)
  File "./tools/external/sh.py", line 516, in handle_command_exit_code
    raise exc(self.ran, self.process.stdout, self.process.stderr)
sh.ErrorReturnCode_2: 

  RAN: '/usr/bin/make -C /Users/Tim/dev/kivy-ios/build/hostpython/x86_64/Python-2.7.1 bininstall inclinstall'

  STDOUT:
Makefile:1392: warning: overriding commands for target `Modules/posixmodule.o'
Makefile:1284: warning: ignoring old commands for target `Modules/posixmodule.o'
Makefile:1393: warning: overriding commands for target `Modules/posixmodule.so'
Makefile:1285: warning: ignoring old commands for target `Modules/posixmodule.so'
Makefile:1394: warning: overriding commands for target `Modules/errnomodule.o'
Makefile:1286: warning: ignoring old commands for target `Modules/errnomodule.o'
Makefile:1395: warning: overriding commands for target `Modules/errnomodule.so'
Makefile:1287: warning: ignoring old commands for target `Modules/errnomodule.so'
Makefile:1396: warning: overriding commands for target `Modules/pwdmodule.o'
Makefile:1288: warning: ignor... (2782 more, please see e.stdout)

  STDERR:

This might be useful:

$ ./toolchain.py recipes
audiostream  master  
click        master  
distribute   0.7.3   
ffmpeg       2.6.3   
ffpyplayer   v3.2    
flask        master  
freetype     2.5.5   
host_setuptools None    
hostlibffi   3.2.1   
hostpython   2.7.1   
ios          master  
itsdangerous master  
jinja2       master  
kivy         1.9.1   
libffi       3.2.1   
libjpeg      v9a     
markupsafe   master  
moodstocks   4.1.5   
numpy        1.9.1   
openssl      1.0.2h  
photolibrary master  
pil          2.8.2   
pkgresources None    
plyer        master  
pycrypto     2.6.1   
pymoodstocks master  
pyobjus      master  
python       2.7.1   
pyyaml       3.11    
sdl2         iOS-improvements
sdl2_image   2.0.0   
sdl2_mixer   2.0.0   
sdl2_ttf     2.0.12  
werkzeug     master 

I notice when libffi is configuring, it says:

checking for mkostemp... yes

Is that right? The line in libffi that calls mkostemp : https://github.com/libffi/libffi/blob/5d0365c605c472f40d1195cf7ba04ae08e360cb7/src/closures.c#L502