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When I compile Python-3.0a1 on Mac OS X with Japanese locale,
I've got LookupError like below.
==========================================
running build_scripts
creating build/scripts-3.0
Traceback (most recent call last):
 File "./setup.py", line 1572, in <module>
 main()
 File "./setup.py", line 1567, in main
 'Lib/smtpd.py']
 File "/private/tmp/Python-3.0a1/Lib/distutils/core.py", line 148, in setup
 dist.run_commands()
 File "/private/tmp/Python-3.0a1/Lib/distutils/dist.py", line 943, in
run_commands
 self.run_command(cmd)
 File "/private/tmp/Python-3.0a1/Lib/distutils/dist.py", line 963, in
run_command
 cmd_obj.run()
 File "/private/tmp/Python-3.0a1/Lib/distutils/command/build.py", line
106, in run
 self.run_command(cmd_name)
 File "/private/tmp/Python-3.0a1/Lib/distutils/cmd.py", line 317, in
run_command
 self.distribution.run_command(command)
 File "/private/tmp/Python-3.0a1/Lib/distutils/dist.py", line 963, in
run_command
 cmd_obj.run()
 File
"/private/tmp/Python-3.0a1/Lib/distutils/command/build_scripts.py", line
51, in run
 self.copy_scripts()
 File
"/private/tmp/Python-3.0a1/Lib/distutils/command/build_scripts.py", line
82, in copy_scripts
 first_line = f.readline()
 File "/private/tmp/Python-3.0a1/Lib/io.py", line 1259, in readline
 decoder = self._decoder or self._get_decoder()
 File "/private/tmp/Python-3.0a1/Lib/io.py", line 1111, in _get_decoder
 make_decoder = codecs.getincrementaldecoder(self._encoding)
 File "/private/tmp/Python-3.0a1/Lib/codecs.py", line 951, in
getincrementaldecoder
 decoder = lookup(encoding).incrementaldecoder
LookupError: unknown encoding: X-MAC-JAPANESE
make: *** [sharedmods] Error 1
==========================================
This problem happens for lack of appropriate codec
so also occurs in apps using getdefaultencoding.
After patching Tools/unicode/Makefile and
running make generates build/mac_japanese.py, mac-japanese codec.