VPDA is built and managed using maven. If you use maven for your project, then integration of vpda is very easy. You can use maven repository http://vpda.org/maven-repo and use vpda as any artifact dependency. You can find groupId and artifactId in project summary for each module. / If you do not use maven, you must compile versus packaged jars in distribution zip file.in dist/modules folder.
After downloading distribution zip file there is src folder. This is root source folder with main project pom and all submodules.
If u want just to build without distribution zip, issue maven command
mvn clean install
If u want build also with distribution zip and sources, issue maven command
mvn clean install assembly:attached install:install
If u have some problem with downloading project dependencies, add profile which will add more repositories
mvn COMMAND -Pvpda.repos