If you would like to modify Ragel and need to build Ragel's scanners and
parsers from the specifications then set "build_parsers=yes" the DIST file and
reconfigure. This variable is normally set to "no" in the distribution tarballs

and "yes" in version control.

README中提示：从版本控制系统中下载的在linux下编译，需要安装预先安装Ragel的binary版和kelbt才能编译，否则编译中会出错。
下载的tarball版，则不需要。

我编译了Ragel windows version版本，下载 http://download.csdn.net/detail/sgzwiz/4611822