>python setup.py install
running install
running bdist_egg
running egg_info
writing dulwich.egg-info\PKG-INFO
writing top-level names to dulwich.egg-info\top_level.txt
writing dependency_links to dulwich.egg-info\dependency_links.txt
reading manifest file 'dulwich.egg-info\SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'dulwich.egg-info\SOURCES.txt'
installing library code to build\bdist.win32\egg
running install_lib
running build_py
running build_ext
building 'dulwich._objects' extension
error: Unable to find vcvarsall.bat