com.lutris.ant.taskdefs.XMLc not found

Hi,
After installing enhydra5.0 (binary) on Slackware8.1, I get the
following error message, when I ran ant:

        build.xml:34: taskdef class com.lutris.ant.taskdefs.Xmlc cannot be
        found

I have many jar files including /enhydra5.0/lib/xmlc.jar and
../java/lib/tools.jar in my CLASSPATH,
and $JAVA_HOME/bin and /usr/local/enhydra5.0/bin are on my PATH. It is
working fine with the same setting in RH8.0 and Debian3.0.  Have I missed
any thing here?

Exactly same error message in window platform was reported in mailling
list few months ago, and putting xmlc.jar in CLASSPATH was advised.  Did
it work?

Any pointers would be highly appreicate.
  
Damar