= Linux =
Install GTK [http://www.gnu.org/software/emacs/ Emacs], [http://www.gnuplot.info/ Gnuplot] and [http://www.graphviz.org/ Graphviz] by typing
{{{
 sudo apt-get install emacs22-gtk gnuplot-x11 graphviz
}}}
in your terminal.

2. Download [http://trac.clozure.com/openmcl ccl], unpack the archive and move the ccl folder somewhere, for example to {{{/usr/local/share/ccl}}}.

3.Download the latest [http://common-lisp.net/projects/slime Slime], unpack it and move it somewhere, for example to {{{/usr/local/share/slime}}}. Don’t use the slime debian package and don’t use the slime that comes with Emacs.

4. Create or edit the Emacs initialization file {{{~/.emacs}}} with these commands (adapt the paths to your slime and to your ccl):
{{{
 (custom-set-variables
  '(cua-mode t nil (cua-base))
   ;;; uncomment this if you don't want the tool bar
   ;; '(tool-bar-mode nil)
   '(show-paren-mode t)
   '(column-number-mode t)
   '(indent-tabs-mode nil)
   '(make-backup-files nil))

 (add-to-list 'load-path "/usr/local/share/slime")
 (require 'slime)

 (setq inferior-lisp-program "/usr/local/share/ccl/lx86cl64")
 ;;; use this in 32Bit Linux
 ;;(setq inferior-lisp-program "/usr/local/share/ccl/lx86cl")

 (slime-setup '(slime-repl slime-autodoc slime-fancy-inspector))

 ;;; this automatically starts the lisp
 (command-execute 'slime)
}}}

5. Start Emacs. It should automatically start a lisp listener and look like this:\\
[[Image(http://ai.vub.ac.be/tracbabel2/BabelInstallation/emacs-on-linux.png)]]\\
 If not, check the {{{*messages*}}} buffer of Emacs to see what went wrong. It might for example be that your previous installation of Emacs automatically loaded another slime (in this case check the {{{/etc/emacs/site-start.d/}}}} folder).

6. Finally, install [http://www.google.com/chrome?platform=linux&hl=nl Chrome] (recommended) or [http://www.mozilla.com/firefox Firefox] for interacting with the web interface of Babel2.

7. Take 30 minutes to read [wiki:UsingEmacs how to use Emacs together with Lisp] and then follow the instructions for [wiki:Babel2Install setting up Babel2].