Missing link to lisp sources in describe-function / describe-variable

[Florian Kaufmann]

I am used to that the help buffer of describe-function, describe-variable & co 
contain a link to the lisp sources where the symbol is defined. I get a link 
for symbols defined in my own libraries. I have the C source of Emacs 
installed, and for symbols defined there I also get a link. However the link is 
gone for symbols defined within standard lisp libraries that come with Emacs. 

Also find-library does not find anything in standard libraries. load-library 
however works. 

I assume that I have to set the path to the Elisp libraries somehow, analogous 
to find-function-C-source-directory, but I can't figure it out.


I have Ubuntu 12.10, I have the emacs23-el package installed, I have GNU Emacs 
23.4.1