To build JiBX/WS, either from the distribution or from a SVN image, use the Ant build.xml file in the build directory. The default Ant target just rebuilds the lib/jibx-ws.jar file from the source code. The "distrib" target builds the actual distribution zip file, while the "develop" target builds the lib/jibx-ws.jar file along with internal JavaDocs.
If building from a SVN image, you will need to populate the dep-lib and spring-lib directories with the required dependencies.
The dependencies are managed using Apache Ivy and are specified in the