From mboxrd@z Thu Jan  1 00:00:00 1970
From: Achim Gratz <Stromeko@Nexgo.DE>
Subject: Re: Bug: "Lisp error: (void-variable org-babel-tangle-lang-exts)"
 when loading languages at startup
Date: Mon, 25 Mar 2013 10:05:06 +0100
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Am 25.03.2013 01:41, schrieb Trevor Murphy:
> (add-to-list 'load-path "/home/trevor/.emacs.d/elpa/org-20130318/")

Don't do this with Org from ELPA, I don't think it will work.  Try 
'(package-initialize)' instead.

> Seems that the defvar counts for nothing? Perhaps because it's already a
> defcustom in ob-tangle.el? I don't understand emacs well enough to know,
> but I will say that inserting a "(require 'ob-tangle)" anywhere before the
> offending line "solves" the problem.

You are missing the autoloads and the defcustom definitions because the 
package hasn't been initialized.


Regards,
-- 
Achim.

(on the road :-)