As of 2008, the Autotools plugins have been moved to the Eclipse Linux Tools project. Please visit their new home:
http://www.eclipse.org/linuxtools

If you were using the Autotools plugin(s) from this site, you will need to uninstall them and re-install the ones from the Eclipse Linux Tools project. Project may need to be cleaned of references to the com.redhat.eclipse.autotools toolchain.

For information related to Eclipse in Fedora, please see:
http://fedoraproject.org/wiki/Eclipse