Go to http://ant.apache.org/, download the binary (get version 1.6.2) and extract the distribution.
Add the ANT_HOME/bin directory to your PATH.
Copy the junit.jar found when you unpack the junit distribution, into the ANT_HOME/lib directory. This is needed so we can run unit tests as part of the ant build.
Verify that it is installed by typing ant and the command prompt:
jurn@brownfang ~ $ ant Buildfile: build.xml does not exist! Build failed