build.xml

<project name="ProjectKorra" basedir="." default="main">
    <property name="dir.src"     value="src"/>
    <property name="dir.build"   value="build"/>
    <property name="dir.classes" value="${dir.build}/classes"/>
    <property name="dir.jar"     value="${dir.build}/jar"/>
	<property name="dir.lib"     value="lib"/>

    <property name="main-class"  value="com.projectkorra.projectkorra.ProjectKorra"/>

    <target name="clean">
        <delete dir="${dir.build}"/>
    </target>

    <target name="compile">
        <mkdir dir="${dir.classes}"/>
        <javac srcdir="${dir.src}" destdir="${dir.classes}">
    		<classpath>
    			<fileset dir="${dir.lib}">
    				<include name="*.jar"/>
    			</fileset>
    		</classpath>
        </javac>
    </target>

    <target name="jar" depends="compile">
        <mkdir dir="${dir.jar}"/>
        <jar destfile="${dir.jar}/${ant.project.name}.jar" basedir="${dir.classes}">
            <manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
        </jar>
    </target>

    <target name="clean-build" depends="clean,jar"/>
    <target name="main" depends="clean,jar"/>
</project>