JBE with RSA ant - include librarys

Hello together,

I'm trying to use the JBE with RSA for Builds.
The problem is that i don't know how to include the libs.

Short Question: How do i include the build toolkit ant library's into the RSA8 ant call?

-------------------------------

Long story:

For my task i got an ant script that uses both, RSA (<projectSetBuild>, ...) and  RTC (<buildDefinitionId>, <buildResultPublisher>) functions.
In RTC-Eclipse, I created a build definition with command line to invoke the runAnt.bat of RSA.

I included the lib argument into the command line as indicated here:
http://pic.dhe.ibm.com/infocenter/clmhelp/v4r0m1/topic/com.ibm.team.build.doc/topics/r_ant-tasks.html

The properties of command line are like this:
Command line: <RSA_HOME>\bin\runAnt.bat
Arguments: -buildfile <BUILD_FILE_HOME>\build.xml -lib <installdir>\buildsystem\buildtoolkit

But always i request a build, i got an error in the log file:  -lib not supported

Anyone know what I'm doing wrong?

Kind Regards