probably a simple question.

<target name="build-module-a" if="module-A-present">

This would execute only if the property is set. Is there a way to check if a value not is set? (This will be practical if certain libraries are not present, recompile them and put the jar's in the right location so they can be used by the project)


Anything you do will be insignificant, but it is very important that you do it
-- Mahatma Gandhi