On 25 Aug 2015, Nikolaus@rath.org wrote:
On Aug 25 2015, Erik Colson <eco@ecocode.net> wrote:
> Nikolaus Rath <Nikolaus@rath.org> writes:
>
>>> Can someone tell me how to change the default PDF viewer from Emacs' new
>> internal document viewer to an external program?
>
>> which OS are you on ?

> Gnus/5.130014 (Ma Gnus v0.14) Emacs/24.4 (gnu/linux)

I had the same issue. The problem these days is that Emacs favours a
Lisp based reader (doc-view, in this case) to whatever is define in
mailcap. I googled the problem and this is the solution I found that
works. For example, I have define Okular as the pdf reader in mailcap:

#+BEGIN_SRC emacs-lisp
;;Remove doc-view so pdf will open with Okular
(setcdr
   (assoc "application" mailcap-mime-data)
   (remove '("pdf"
             (viewer . doc-view-mode)
             (type . "application/pdf")
             (test eq window-system 'x))
           (cdr (assoc "application" mailcap-mime-data))))
#+END_SRC

Just cut and paste what is between BEGIN_SRC and END_SRC and put it in
your init file.

Charles

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