build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="yui3" default="all">
    <description>YUI 3</description>
    <macrodef name="build-all">
        <attribute name="target"/>
        <sequential>
            <subant target="@{target}">
                <fileset dir="." includes="*/build.xml"/>
            </subant>
        </sequential>
    </macrodef>
    <target name="all">
        <build-all target="all"/>
    </target>
    <target name="clean">
        <build-all target="clean"/>
    </target>
</project>