Prelude: Ant-Contrib provides a very well explained wiki page for installation and launch ([http://ant-contrib.sourceforge.net/#install][1]).
Indeed
I use my custom in-build.xml installer. This bad boy detects if you have it in your ant lib dir, then downloads and inits it if it's not.
All you need to do is add a depends="init-ant-contrib" to your target, and bam. You have ant-contrib whenever/wherever you deploy -- As long as sourceforge doesn't take away the dl link.