Reference xdocpath not found

[Sam Wun]

Hi, I just installed xdoclet and created a build.xml file (shown below),
but execution of ant command failed with the followoing errors:
# ant
Buildfile: build.xml

compile:

BUILD FAILED
/usr/liferay/liferay-portal-5.2.2/dev/portlets/online-payment/build.xml:14:
Reference xdocpath not found.

Total time: 6 seconds

Here is the content of build.xml file:
# cat build.xml
<?xml version="1.0"?>

<project name="portlet" basedir="." default="deploy">
      <import file="../build-common-portlet.xml" />

      <target name="compile">
              <mkdir dir="docroot/WEB-INF/classes" />

              <path id="plugin-lib.classpath">
                      <pathelement
location="${app.server.classes.portal.dir}" />
                      <fileset dir="${app.server.lib.portal.dir}"
includes="*.jar" />
                      <pathelement location="docroot/WEB-INF/classes" />
              </path>
  <taskdef name="webdoclet"
classname="Xdoclet.modules.web.WebDocletTask" classpathref="xdocpath">
  </taskdef>
  <webdoclet destdir="WEB-INF" mergedir="metadata/web"
excludedtags="@version,@author" verbose="true">
      <fileset dir="WEB-INF/src">
          <include name="**/*Form.java" />
          <include name="**/*Action.java" />
          <include name="**/*Servlet.java" />
      </fileset>
      <deploymentdescriptor validatexml="true"
        servletspec="2.3" sessiontimeout="60"
        destdir="WEB-INF" distributable="false">
      </deploymentdescriptor>
      <strutsconfigxml validatexml="true" version="1.1"/>
      <strutsvalidationxml/>
  </webdoclet>


              <javac
                      classpathref="plugin.classpath"
                      compiler="${javac.compiler}"
                      debug="${javac.debug}"
                      deprecation="${javac.deprecation}"
                      destdir="docroot/WEB-INF/classes"
                      nowarn="${javac.nowarn}"
                      srcdir="docroot/WEB-INF/src3"
              />

              <antcall target="build-common-plugin.compile" />
      </target>

      <target name="build-lang">
              <antcall target="build-lang-cmd">
                      <param name="lang.dir"
value="docroot/WEB-INF/src/content/test" />
                      <param name="lang.file" value="Language" />
              </antcall>
      </target>
</project>

Can anyone tell me how to setup Xdoclet in unix? (linux/freebsd)
Your suggestion is very much appreciated.
Thanks

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