pluto portal as ROOT app in Tomcat

Bonjour,

Is it possible to install Pluto Portal as the ROOT application in Tomcat 6.

I build PLUTO 2  from source on a ubuntu box with:

mvn install

and

mvn pluto2:install -DinstallDir=/usr.../tomcat6

This installs Pluto as a standard webapp.  May be I missed some other 
parameters ?

Anyway when I try "by hand" to replace the ROOT application by pluto it 
does not work
I have the login page to the portal, I can identify myself but it cannot 
find other portlets.
I tried to "play" with the various context settings but it was of no help.

Any idea welcome !!

Cordialement

Philippe