choosing autoconf and automake versions

I see there are many version of autoconf a开发者_如何转开发nd automake available in my ubuntu linux. If I want create a new project from scratch, what's best choice, latest versions or older versions?

Go with the latest version. It's only developers who are rebuilding the configure system that need to use autoconf and automake (and thus need to have the newer version installed), which likely just means "you"; it won't affect users who are just building your project using your distributed configure files.