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Python 2.6a2 on Windows XP
Distutils fails to build an extension module for MinGW. Even though 
mingw32 is specified as the compiler distutils.msvc9compiler is still 
loaded and it cannot find vcvarsall.bat. Here is an example:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
[snip]
C:\pygame\ext>path=%path%;C:\python26;C:\mingw\bin
C:\pygame\ext>set MINGW_ROOT_DIRECTORY=C:\mingw
C:\pygame\ext>python setup.py build --compiler=mingw32
running build
running build_ext
error: None
C:\pygame\ext>python setup.py build_ext --compiler=mingw32
Traceback (most recent call last):
 File "setup.py", line 6, in <module>
 ext_modules=[Extension('simple', ['simple.c',]),],
 File "C:\python26\lib\distutils\core.py", line 137, in setup
 ok = dist.parse_command_line()
 File "C:\python26\lib\distutils\dist.py", line 459, in 
parse_command_line
 args = self._parse_command_opts(parser, args)
 File "C:\python26\lib\distutils\dist.py", line 517, in 
_parse_command_opts
 cmd_class = self.get_command_class(command)
 File "C:\python26\lib\distutils\dist.py", line 836, in 
get_command_class
 __import__ (module_name)
 File "C:\python26\lib\distutils\command\build_ext.py", line 21, in 
<module>
 from distutils.msvccompiler import get_build_version
 File "C:\python26\lib\distutils\msvccompiler.py", line 658, in 
<module>
 from distutils.msvc9compiler import MSVCCompiler
 File "C:\python26\lib\distutils\msvc9compiler.py", line 286, in 
<module>
 VC_ENV = query_vcvarsall(VERSION, ARCH)
 File "C:\python26\lib\distutils\msvc9compiler.py", line 253, in 
query_vcvarsall
 raise IOError("Unable to find vcvarsall.bat")
IOError: Unable to find vcvarsall.bat
C:\pygame\ext>type setup.py
from distutils.core import setup, Extension
setup(name='Simple',
 version='1.0',
 description='Python extension module test',
 ext_modules=[Extension('simple', ['simple.c',]),],
 )
C:\pygame\ext>gcc --version
gcc (GCC) 3.4.5 (mingw special)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is 
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.
C:\pygame\ext>python -V
Python 2.6a2