See documentation on build.xml how product is build. 1. See build/GWT-VERSION.properties file - states the GWT version used within this project 2. Checkout correct GWT distribution version for your platform - note, you have to checkout GWT for all platforms when doing release builds 3. Extract or link GWT distribution under build/gwt/ directory / directories - = linux|windows|mac 4. Update Eclipse project classpath build/gwt//gwt-user.jav and gwt-dev-.jar Note: All GWT distributions have been moved to https://svn.itmill.com/svn/itmill-toolkit/gwt