build.properties

# Property files contain key/value pairs
key=value

# Property keys may contain alphanumeric chars and colons, but
# not special chars. This way you can create pseudo-namespaces
umil.repository=git://github.com/phpbb/umil.git
umil.version=v1.0.5
umil.directory=${temp.dir}/umil

build.xml

<?xml version="1.0"  encoding="UTF-8" ?>
<project name="phpbb3-nv-who-was-here" basedir="." default="umil">
  <property name="temp.dir" value="temp" />
	<property name="build.dir" value="build" />

	<property file="build.properties" />

	<target name="clean" description="Remove build directories">
		<echo msg="Remove build directories" />
		<delete dir="${build.dir}" />
		<delete dir="${temp.dir}/umil" includeemptydirs="true" verbose="true" />
	</target>

	<target name="prepare" depends="clean" description="Prepare packaging">
		<echo msg="Creating directories" />
		<mkdir dir="${build.dir}" />
		<mkdir dir="${temp.dir}" />
	</target>

	<target name="umil" depends="clean,prepare" description="Download phpBB/UMIL">
		<echo msg="Download phpBB/UMIL" />
		<gitclone gitPath="git" repository="${umil.repository}" targetPath="${umil.directory}" />
		<gitcheckout gitPath="git" repository="${umil.directory}" branchname="${umil.version}" quiet="true" create="true" />
	</target>
</project>