Many thanks Nick for this help. I am going to inspect my user.el file, in
order to correct it, and I will inform you about the result.

Best wishes,

Jo.

Le mar. 12 mars 2019 à 22:34, Nick Dokos <ndokos@gmail.com> a écrit :

> Joseph Vidal-Rosset <joseph.vidal.rosset@gmail.com> writes:
>
> > ...
> > it  is also  possible to  get sections  in a
> > letter with scrlttr2 class. Nevertheless, I have to write the latex code
> > \section{}  and I  ignore how  getting  sections via  org-mode for  this
> > class. Is it possible to get an org-mode translation for section in this
> > class?
> >
>
> C-h v org-latex-classes RET
>
> Briefly, you need to add a new element to it, describing what you want org
> to do with this class.
>
> Here's a snippet from my init file that adds two latex classes to this
> variable. Hope this makes the process clear:
>
> --8<---------------cut here---------------start------------->8---
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ;;; latex export
> (setq revtex-class
>       '("revtex" "\\documentclass[11pt]{revtex4-1}"
>         ("\\section{%s}" . "\\section*{%s}")
>         ("\\subsection{%s}" . "\\subsection*{%s}")
>         ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
>         ("\\paragraph{%s}" . "\\paragraph*{%s}")
>         ("\\subparagraph{%s}" . "\\subparagraph*{%s}")))
>
> (setq koma-article-class
>       '("koma-article" "\\documentclass[11pt]{scrartcl}"
>         ("\\section{%s}" . "\\section*{%s}")
>         ("\\subsection{%s}" . "\\subsection*{%s}")
>         ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
>         ("\\paragraph{%s}" . "\\paragraph*{%s}")
>         ("\\subparagraph{%s}" . "\\subparagraph*{%s}")))
>
> (progn
>     (require 'ox-latex)
>     (add-to-list 'org-latex-classes revtex-class t)
>     (add-to-list 'org-latex-classes koma-article-class t)))
> --8<---------------cut here---------------end--------------->8---
>
> --
> Nick
>
> "There are only two hard problems in computer science: cache
> invalidation, naming things, and off-by-one errors." -Martin Fowler
>
>
>