+
+;; org babel support
+(org-babel-do-load-languages
+ 'org-babel-load-languages
+ '((emacs-lisp . t )
+ (R . t)
+ (latex . t)))
+;; org-babel-by-backend
+(defmacro org-babel-by-backend (&rest body)
+ `(case (if (boundp 'backend)
+ (org-export-backend-name backend)
+ nil) ,@body))
+
+
+