For details of how to configure projects and modules, please refer to the online documentation:

http://gump.apache.org/metadata/builder.html

In particular:

Ant - http://gump.apache.org/metadata/builder.html#ant
Maven - http://gump.apache.org/metadata/builder.html#maven
MVN (Maven2) - http://gump.apache.org/metadata/builder.html#mvn

N.B.

<option> and <depends> in Gump descriptors fill more than one purpose:
 * building up CLASSPATHs for Ant builds and jar overrides for Maven 1 projects
 (this is not necessary in the mvn case)
 * determining build order and this remains important in the mvn case as well.
 
 For M2 projects, it is recommended to use <option> for each top-level project depended on.