There seems to be a bootstrap issue here.  Building with ./configure --with-pydebug --prefix=... on OS X in a clean source directory (hg purge --all), 'make' makes it to building the static libpython .a but then dies on the sysconfig generate-posix-vars step:

ar rc libpython3.4dm.a Modules/_threadmodule.o  Modules/signalmodule.o  Modules/posixmodule.o  Modules/errnomodule.o  Modules/pwdmodule.o  Modules/_sre.o  Modules/_codecsmodule.o  Modules/_weakref.o  Modules/_functoolsmodule.o  Modules/operator.o  Modules/_collectionsmodule.o  Modules/itertoolsmodule.o  Modules/_localemodule.o  Modules/_iomodule.o Modules/iobase.o Modules/fileio.o Modules/bytesio.o Modules/bufferedio.o Modules/textio.o Modules/stringio.o  Modules/zipimport.o  Modules/faulthandler.o  Modules/symtablemodule.o  Modules/xxsubtype.o
/usr/bin/ranlib: file: libpython3.4dm.a(dynamic_annotations.o) has no symbols
/usr/bin/ranlib: file: libpython3.4dm.a(pymath.o) has no symbols
ranlib libpython3.4dm.a
ranlib: file: libpython3.4dm.a(dynamic_annotations.o) has no symbols
ranlib: file: libpython3.4dm.a(pymath.o) has no symbols
/usr/bin/clang   -framework CoreFoundation -o python Modules/python.o libpython3.4dm.a -ldl  -framework CoreFoundation     
./python -E -S -m sysconfig --generate-posix-vars
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Traceback (most recent call last):
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/runpy.py", line 160, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/runpy.py", line 73, in _run_code
    exec(code, run_globals)
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/sysconfig.py", line 683, in <module>
    _main()
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/sysconfig.py", line 671, in _main
    _generate_posix_vars()
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/sysconfig.py", line 374, in _generate_posix_vars
    pybuilddir = 'build/lib.%s-%s' % (get_platform(), sys.version[:3])
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/sysconfig.py", line 651, in get_platform
    get_config_vars(),
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/sysconfig.py", line 520, in get_config_vars
    _init_posix(_CONFIG_VARS)
  File "/py/dev/default/b10.7_t10.7_x4.3_cclang_d/unix/source/Lib/sysconfig.py", line 393, in _init_posix
    from _sysconfigdata import build_time_vars
ImportError: No module named '_sysconfigdata'