Hi all, At last, I could build Shoes Policeman with my new Windows 7. :) The commit is this: http://github.com/ashbb/rubyinstaller/commit/a274cff62a498f609593057e08869740deb4c3e1 Just only updated dependencies. :-P I'm not sure why previous dependencies didn't work well on Windows 7. But I read some blogs which said it was better to update MinGW and MSYS. So, I've just tried to update. Then got a lucky break. :) ashbb