This build file downloads JAR files that optional Ant tasks use, and installs them in a location that is accessible the next time Ant runs. You can choose three locations, by going -Ddest=LOCATION on the command line -Ddest=user user lib dir ${user.home}/.ant/lib -Ddest=system ant lib dir ${ant.home}/lib --Default-- -Ddest=optional optional dir ${ant.home}/lib/optional (for Ant developers) You may also need to set proxy settings. This can be done on the command line, or in ${user.home}/.ant/proxy.properties proxy.host hostname of proxy proxy.port port (default 80) proxy.user user (default="") proxy.pass pass (default="" ) Note that this project does not download any scripting language implementations. proxy: ${proxy.host}:${proxy.port} [${proxy.user}/${proxy.pass}] Unknown destination : ${dest} Downloading to ${dest.dir} Fetch the ant task JAR from http://maven.apache.org/maven2/ant-tasks.html Unknown archive @{archive}