Didier Verna <verna(a)inf.enst.fr&gt; writes in xemacs-beta(a)xemacs.org: Two ways. One can follow the instructions in lisp/site-load.el and create a site-packages file. The way is to put together a custom dumped-lisp.el somewhere in the load-path. It should work for the file to be in site-lisp/ if site-lisp is configured into your XEmacs, or into the xemacs-packages/lisp/ directory. Restricted in the sense of being distributed from ftp.xemacs.org. Installers are free to do The Right Thing for their site. The point of the restriction on our side is to give the installer maximum flexibility on how much stuff gets dumped. If everyone at a site uses package `foo' and foo is relatively static then it is an excellent candidate for dumping. A dumped package that isn't used is pure, 100% wasted space. An undumped lisp package can be entirely eliminated by deleting its lisp directory. A dumped lisp package cannot be eliminated without redumping the xemacs binary.