Converting less to css via Ant build script.

gistfile1.txt

<property name="included.less.stylesheets" value="first.less,second.less"/>
<property name="tool.lessc" value="/build/tools/lessc/lessc.cmd"/>
<property name="css.dir" value="css" />
<property name="less.dir" value="less" />

<target name="-less">
     <for param="less.file" list="${included.less.stylesheets}">
        <sequential>
            <echo>compiling @{less.file} to @{less.file}.css</echo>
            <exec dir="${basedir}" executable="${tool.lessc}" failifexecutionfails='true'>
                <arg line='"${basedir}/${css.dir}/${less.dir}/@{less.file}" "${basedir}/${css.dir}/@{less.file}.css"' />
            </exec>
        </sequential>
    </for>
</target>

Hi, can you please show me how to use this? I just want export less of ant which I custommed to css file