build.xml

<?xml version="1.0"?>
<project name="Traces" default="main" basedir=".">
  <property name="FLEX_HOME" value="../flex_sdk_4.5.1" />
  <taskdef resource="flexTasks.tasks" classpath="${FLEX_HOME}/ant/lib/flexTasks.jar" />
  <property name="APP_SRC" value="${basedir}/src"/>
  <property name="OUTPUT" value="${basedir}/bin/Traces.swc"/>

  <target name="main" depends="clean,compile"/>
  <target name="clean">
    <delete dir="${OUTPUT}"/>
  </target>
  <target name="compile">   
    <fileset dir="${APP_SRC}" id="src.files">
      <include name="**/**"/>
    </fileset>
    <pathconvert property="src_classes" pathsep=" " dirsep="." refid="src.files">  
      <map from="\" to="/"/>  
      <map from="${APP_SRC}/" to=""/>  
      <mapper> 
        <chainedmapper>  
          <globmapper from="*.as" to="*"/>  
        </chainedmapper>  
      </mapper>  
    </pathconvert>
    <compc output="${OUTPUT}"
           include-classes="${src_classes}"
           actionscript-file-encoding="UTF-8"
           keep-generated-actionscript="true"
           static-link-runtime-shared-libraries="true"
           debug="true">
      <source-path path-element="${APP_SRC}" />
      <compiler.include-libraries dir="lib" append="true">
        <include name="as3corelib.swc" />
      </compiler.include-libraries>
      <external-library-path dir="${FLEX_HOME}/frameworks" append="true">
        <include name="libs/framework.swc" />
      </external-library-path>
    </compc>
  </target>
</project>