[AUCTeX] Path completion fails: C-c RET \includegraphics

[Jonas Stein]

Hi,

i use emacs 24 with auctex. 
My masterfile "mf.tex" uses a preamble.tex where i define
\graphicspath{{/home/stein/my/uni/thesis/gfx/}}

While editing mf.tex i type 
 C-c RET \includegraphics

to include a picture and want to complete with TAB, 
but auctex seems not know about the graphicspath

Do you have any hints for me? 
If someone is interested in my config, i made it public [1]

Have a nice weekend,

[1] https://github.com/jonasstein/emacs-config

-- 
Jonas Stein <address@hidden>