error: Unable to find vcvarsall.bat

 

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 setup.py .

Execute the following command based on the version of Visual Studio installed:

  • 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%

    • 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.

    I found the solution. I had the exact same problem, and error, installing 'amara'. I had mingw32 installed, but distutils needed to be configured.

  • I have Python 2.6 that was already installed.
  • I installed mingw32 to C:programsmingw
  • Add mingw32's bin directory to your environment variable: append c:programsMinGWbin; to the PATH

  • Edit (create if not existing) distutils.cfg file located at C:Python26Libdistutilsdistutils.cfg to be: 

    [build]
compiler=mingw32

  • Now run easy_install.exe amara .

    • Make sure environment is set by opening a new cmd.exe .

    您可以从http://www.lfd.uci.edu/~gohlke/pythonlibs/安装编译版本

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