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Using py3k r87206 on Mac OSX 10.6.5,
[~/Sources/py3k]> make testall
running build
running build_ext
building dbm using ndbm
Python build finished, but the necessary bits to build these modules were not found:
_gdbm ossaudiodev spwd 
To find the necessary bits, look in setup.py in detect_modules() for the module's name.
running build_scripts
find ./Lib -name '*.py[co]' -print | xargs rm -f
./python -Wd -E -bb ./Lib/compileall.py
Traceback (most recent call last):
 File "./Lib/compileall.py", line 223, in <module>
 exit_status = int(not main())
 File "./Lib/compileall.py", line 205, in main
 if os.path.isdir(dest):
 File "/Users/cartman/Sources/py3k/Lib/genericpath.py", line 41, in isdir
 st = os.stat(s)
TypeError: Can't convert 'NoneType' object to str implicitly
make: *** [testall] Error 1

I'm not sure why you would be seeing a test failure on OSX when we aren't seeing it on other platforms, but the cause of the bug is known. It should be fixed by the last patch attached to issue 10453. If you could test that patch it would be great, but please comment on that issue; I'm going to close this one as a duplicate.