build.xml

<project name="blitespy" default="compile" basedir=".">

	<property file="build.properties" />

	<property name="src" location="src"/>
	<property name="lib" location="lib"/>
	<property name="jar" location="${lib}/blitespy.jar"/>
	<property name="cls" location="classes"/>

	<target name="init">
		<mkdir dir="${cls}"/>
	</target>

	<!-- Development classpath -->
	<path id="project.classpath">
		<fileset dir="${lib}">
			<exclude name="**/blitespy.jar"/>
		</fileset>
	</path>

	<!-- Runtime classpath (manifest formatted) -->
	<manifestclasspath property="jar.classpath" jarfile="${jar}">
        <classpath>
        	<fileset dir="${lib}"/>
        </classpath>
    </manifestclasspath>

	<target name="compile" depends="init">
		<javac srcdir="${src}" destdir="${cls}" source="11" target="11" debug="true" includeantruntime="false">
			<classpath refid="project.classpath"/>
		</javac>
	</target>

	<target name="clean">
		<delete includeemptydirs="true">
			<fileset dir="${cls}" includes="**/*"/>
		</delete>
	</target>

	<target name="jar" depends="clean, compile">
		<jar jarfile="${jar}">
			<fileset dir="${cls}"/>
			<manifest>
				<attribute name="Class-Path" value="${jar.classpath}"/>
			</manifest>
		</jar>
	</target>

</project>