> $ ./autogen.sh > checking for build system type... > ^C > > No damn, I wanted to generate configure, not run it! How do I clean up the mess it made just now?

I always run "./autogen.sh --help" for exactly that reason; then if I see --help output from configure, I know that autogen.sh "helpfully" ran configure for me.

You can also usually just run "autoreconf -v -f -i" directly, unless the package has done something unusual that it needs to take extra steps in autogen for.