[AUCTeX] Errors on Debian

[Andreas Röhler]

 With Emacs built from current source at Debian get the following kind 
of error:

Debugger entered--Lisp error: (file-error "Cannot open load file" "Datei 
oder Verzeichnis nicht gefunden" "tex-site")
  require(tex-site)
  eval-buffer(#<buffer  *load*> nil 
"~/.emacs.d/elpa/auctex-11.87.7/auctex-autoloads.el" nil t)  ; Reading 
at buffer position 9880
  
load-with-code-conversion("~/.emacs.d/elpa/auctex-11.87.7/auctex-autoloads.el" 
"~/.emacs.d/elpa/auctex-11.87.7/auctex-autoloads.el" nil t)
  load("~/.emacs.d/elpa/auctex-11.87.7/auctex-autoloads" nil t)
  package--activate-autoloads-and-load-path([cl-struct-package-desc 
auctex (11 87 7) "Integrated environment for *TeX*" nil nil nil 
"~/.emacs.d/elpa/auctex-11.87.7" ((:url . 
"http://www.gnu.org/software/auctex/";)) nil])
  package-activate-1([cl-struct-package-desc auctex (11 87 7) 
"Integrated environment for *TeX*" nil nil nil 
"~/.emacs.d/elpa/auctex-11.87.7" ((:url . 
"http://www.gnu.org/software/auctex/";)) nil] nil)
  package-activate(auctex)
  package-initialize()
  command-line()
  normal-top-level()

;;;;;;#

This is a known error from several Debian installs here.
Whilst Emacs shipped with Debian doesn't show this.

Any idea?

Cheers,

Andreas