Org-plot/org-babel-gnuplot not working

["Garreau\, Alexandre" <galex-713@galex-713.eu>]

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Hello, when I do `org-plot/gnuplot' on a org-plot figure it says
“org-plot/gnuplot: Cannot open load file: gnuplot”.

I also tried org-babel-gnuplot, and on an example code, C-c C-c says
“org-babel-execute-src-block: No org-babel-execute function for
gnuplot!”.

I’m under Debian Testing (Jessy), have version "GNU Emacs 24.3.1
(i586-pc-linux-gnu, GTK+ Version 3.12.2) of 2014-09-07 on babin,
modified by Debian", with Org version 7.9.3f, I’ve installed gnuplot-x11
package via distro, then gnuplot-mode via distro *and* elpa, then org-babel
via ELPA (not found in distro), and I put some come in my init.el to
activate gnuplot, according this:
<http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-gnuplot.html>.

What could be the cause?

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