Hi,

You can use below ant script to build .pkg files

<project default="rules" name="RuleProject">

    
    <property name="eclipsepath" value="."/>
    
    
    <path id="cheese.classpath">
        <pathelement location="${eclipsepath}/build/Beans.jar"/>
    </path>

    <target name="beans" >
        <tstamp/>

        <echo message="CREATING Beans JAR..."/>
        <jar
            jarfile="./build/Beans.jar">

          <fileset
              dir="./bin"/>
        </jar>

    </target>

    <path>
        <pathelement></pathelement>
    </path>
    <path id="drools.classpath">
        <fileset dir="${eclipsepath}/build/lib/">
            <include name="*.jar"/>
        </fileset>
        <pathelement location="target"/>
    </path>

    <taskdef name="compiler" classname="org.drools.contrib.DroolsCompilerAntTask" classpathref="drools.classpath" />

    <target name="rules" >
        <compiler
            srcdir="${eclipsepath}/src/main/rules"
            tofile="${eclipsepath}/target/cheese.pkg"
            classpathref="cheese.classpath"
            binformat="package" >
            <include name="*.drl" />
            
        </compiler>
    </target>


</project>

reference http://www.nabble.com/Ant-compiler-task--td15906277.html#a15907448

Regards,
Ravi T