+** ESS
+#+BEGIN_SRC emacs-lisp :tangle don-configuration.el
+ (require 'ess_configuration)
+#+END_SRC
+
+
+** Polymode
+#+BEGIN_SRC emacs-lisp :tangle don-configuration.el
+ (setq load-path
+ (append '("~/lib/emacs_el/polymode/modes")
+ load-path))
+ (require 'polymode)
+ (require 'poly-R)
+ (require 'poly-noweb)
+ (require 'poly-markdown)
+ (add-to-list 'auto-mode-alist '("\\.Snw" . poly-noweb+r-mode))
+ (add-to-list 'auto-mode-alist '("\\.Rnw" . poly-noweb+r-mode))
+ (add-to-list 'auto-mode-alist '("\\.Rmd" . poly-markdown+r-mode))
+#+END_SRC