Dear friends, Yes, installation of the Perl Template Toolkit itself is easy with yum, but finding the necessary plugins is not. PTT (command: ttree) tells me: ! plugin error - XML.DOM: plugin not found I already installed perl-XML-DOM via yum and a bunch of other packages that I thought might be related, but it does not help. Any one knows what I am missing? Thanks! Take care Oliver -- Oliver Ruebenacker, Post-Doc Researcher Theoretical Biological Physics and Soft Statistical Mechanics Cell Biology at UConn Health Center and Physics at Harvard http://people.deas.harvard.edu/~oliver/