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Why Can't I Find vcvarsall.bat During Python Package Installation, and How Can I Fix It?
- Susan SarandonOriginal
- 2024-12-25 20:50:19990browse
Unable to Find vcvarsall.bat: Troubleshooting Package Installation Errors
During package installations, particularly for the dulwich Python package, users often encounter the cryptic error message "error: Unable to find vcvarsall.bat." This issue pertains to the lack of a compatible Visual Studio installation required for building Python extensions.
To address this problem on Windows systems, Python 2.7 relies on Visual Studio 2008. However, for newer Python versions and newer Visual Studio releases, a workaround is necessary.
To trick Python into using a different Visual Studio version, set the VS90COMNTOOLS environment variable before executing setup.py. The appropriate command depends on the installed Visual Studio version:
- Visual Studio 2010 (VS10): SET VS90COMNTOOLS=%VS100COMNTOOLS%
- Visual Studio 2012 (VS11): SET VS90COMNTOOLS=%VS110COMNTOOLS%
- Visual Studio 2013 (VS12): SET VS90COMNTOOLS=%VS120COMNTOOLS%
- Visual Studio 2015 (VS14): SET VS90COMNTOOLS=%VS140COMNTOOLS%
By setting the VS90COMNTOOLS correctly, you can bypass the error and successfully install the desired package.
Caution: Note that this workaround may not be effective for compiling Python modules.
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