The FWD build process (and usually the execution of the various conversion project build tasks) uses Apache Ant (version 1.9 or later).

Linux Windows
Install it using sudo apt-get install ant. Download the ant binaries in the zip archive from official site: Unpack it to the desired location, set the system variable ANT_HOME to point to the path where ant was unzipped, then include the %ANT_HOME%\bin in the Path.

Use the ant -version command to verify that ant is properly installed. It shows the version of ant.