copying lib\summon\treelib_tab.py -> build\lib.win32-2.6\summon
copying lib\summon\util.py -> build\lib.win32-2.6\summon
copying lib\summon\vector.py -> build\lib.win32-2.6\summon
copying lib\summon\__init__.py -> build\lib.win32-2.6\summon
running build_ext
building 'summon_core' extension
error: Unable to find vcvarsall.bat
thanks