How do I point easy_install to vcvarsall.bat?

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I’d still like to know where to set that reference to vsvarsall.bat…

Well, as martineau wrote you have to have either Visual Studio 2008 or Visual C++ Express installed. Having said that I understand you would like to know where Python looks for this batch file. You can see this by looking at definition of find_vcvarsall function in distutils/msvc9compiler.py standard module. Python checks in turn if any of folders saved in the registry under keys

  • HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\VisualStudio\9.0\Setup\VC\ProductDir
  • HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\VCExpress\9.0\Setup\VC\ProductDir

(for 64bit Windows) or

  • HKEY_LOCAL_MACHINE\Software\Microsoft\VisualStudio\9.0\Setup\VC\ProductDir
  • HKEY_LOCAL_MACHINE\Software\Microsoft\VCExpress\9.0\Setup\VC\ProductDir

(for 32bit Windows) exists and if so it treats such folder as the one containing vcvarsall.bat file. If none of these folders exists Python checks if there’s environment variable VS90COMNTOOLS. If this variable exits Python treats folder two levels above value of this variable as the folder containing vcvarsall.bat file.

See also my other answer which explains why you can’t use MSVC++ 2010 to build extensions for Python 2.6

EDIT:
The VC++ 2008 files are now packaged in an installer from MS which can be downloaded here. Once installed vcvarsall.bat will be in C:\Users\username\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0

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