I tried to install the Python package dulwich:
pip install dulwich
But I get a cryptic error message:
error: Unable to find vcvarsall.bat
The same happens if I try installing the package manually:
> python setup.py install running build_ext building 'dulwich._objects' extension error: Unable to find vcvarsall.bat
Update: Comments point out that the instructions here may be dangerous. Consider using the Visual C++ 2008 Express edition or the purpose-built Microsoft Visual C++ Compiler for Python (details) and NOT using the original answer below. Original error message means the required version of Visual C++ is not installed.
For Windows installations:
While running setup.py for package installations, Python 2.7 searches for an installed Visual Studio 2008. You can trick Python to use a newer Visual Studio by setting the correct path in
VS90COMNTOOLS environment variable before calling
Execute the following command based on the version of Visual Studio installed:
WARNING: As noted below, this answer is unlikely to work if you are trying to compile python modules.
See Building lxml for Python 2.7 on Windows for details.