Packages for eclipse 3.4-3 and eclipse-cdt 5.0.0-2 will appear shortly in extra. We've switched to using the eclipse.org binary distributions for optimal stability and compatibility. It appeared that installing the binary distributions in /opt/eclipse was required; however, we have since determined that everything works fine with eclipse in /usr/share. Eclipse will stay in /usr/share. Enjoy! URL: http://archlinux.org/news/404/