build.xml

<project name="EngineLib" default="EngineLib" basedir=".">

<property file="build.properties"/>

	<taskdef resource="flexTasks.tasks" classpath="${FLEX_HOME}/ant/lib/flexTasks.jar"/>
	<target name="EngineLib">
		<path id="paths">
			<pathelement path="${basedir}/"/>
		</path>
		<pathconvert dirsep="/" property="covbasedir" refid="paths"/>
		<fileset dir="${covbasedir}/src" id="files">    
			<include name="**/*.as"/>
		</fileset>   
		<pathconvert property="classes" pathsep=" " dirsep="." refid="files">   
			<map from="\" to="/"/>    
			<map from="${covbasedir}/src/" to=""/>    
			<mapper>    
				<chainedmapper>    
					<globmapper from="*.as" to="*"/>    
				</chainedmapper>    
			</mapper>    
		</pathconvert>

		
		<echo message="${classes}"/>
		<compc output="${OUTPUT_DIR}/EngineLib.swc" include-classes="${classes}" 
		    optimize="true" benchmark="true" strict="true" actionscript-file-encoding="utf-8" 
		    locale="en_US" allow-source-path-overlap="true" >
			<source-path path-element="${covbasedir}/src"/>

		<compiler.external-library-path dir="${LIBS_DIR}" append="true">
		   <!-- <include name="*.swc"/> -->
		</compiler.external-library-path>
		</compc>            
	</target>
</project>