<target name="jar-libs">
	<outofdate>
		<sourcefiles path="extra-lib/isa-libs.jar"/>
		<targetfiles path="isa-libs.jar"/>
		<sequential>
			<echo message="'isa-libs.jar' out of date, rebuilding…" level="verbose"/>
			<ant dir="extra-lib"/>
			<copy file="extra-lib/isa-libs.jar" tofile="isa-libs.jar"/>
		</sequential>
	</outofdate>
</target>