Hi Tobber,
First of all thank you for your help. Everything worked except for the compilation where it's always texlive context and not standalone.

Running `ConTeXt' on `ntg62' with ``context --once --texutil --nonstop ntg62.tex''

resolvers       | trees | analyzing 'home:texmf'
mtx-context     | run 1: luatex --fmt="/home/fab/texlive/2016/texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9/formats/luatex/cont-en" --interaction="nonstopmode" --jobname="ntg62" --lua="/home/fab/texlive/2016/texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9/formats/luatex/cont-en.lui" --no-parse-first-line --c:currentrun=1 --c:fulljobname="./ntg62.tex" --c:input="./ntg62.tex" --c:kindofrun=3 --c:maxnofruns=1 --c:nonstopmode --c:once --c:texutil "cont-yes.mkiv"
This is LuaTeX, Version 0.95.0 (TeX Live 2016)
system commands enabled.

resolvers       > trees > analyzing 'home:texmf'
open source     > 1 > 1 > /home/fab/texlive/2016/texmf-dist/tex/context/base/mkiv/cont-yes.mkiv

ConTeXt ver: 2016.05.17 19:20 MKIV current fmt: 2016.10.29 int: english/english

system          > 'cont-new.mkiv' loaded
open source     > 2 > 2 > /home/fab/texlive/2016/texmf-dist/tex/context/base/mkiv/cont-new.mkiv
close source    > 2 > 2 > /home/fab/texlive/2016/texmf-dist/tex/context/base/mkiv/cont-new.mkiv

system          > files > jobname 'ntg62', input './ntg62', result 'ntg62'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > 2 > 3 > /home/fab/ntg62.tex
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
backend         > xmp > using file '/home/fab/texlive/2016/texmf-dist/tex/context/base/mkiv/lpdf-pdx.xml'
pages           > flushing realpage 1, userpage 1
close source    > 2 > 3 > /home/fab/ntg62.tex
close source    > 1 > 3 > /home/fab/texlive/2016/texmf-dist/tex/context/base/mkiv/cont-yes.mkiv

mkiv lua stats > used config file: selfautoparent:/texmfcnf.lua;selfautoparent:/texmf-dist/web2c/texmfcnf.lua
mkiv lua stats > used cache path: /home/fab/texlive/2016/texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9
mkiv lua stats > resource resolver: loadtime 0.115 seconds, 1 scans with scantime 0.021 seconds, 0 shared scans, 9 found files, scanned paths: /home/fab/texmf
mkiv lua stats > stored bytecode data: 387 modules (0.337 sec), 82 tables (0.011 sec), 469 chunks (0.348 sec)
mkiv lua stats > traced context: maxstack: 1175, freed: 0, unreachable: 1175
mkiv lua stats > cleaned up reserved nodes: 47 nodes, 9 lists of 444
mkiv lua stats > node memory usage: 11 glue, 2 penalty, 22 attribute, 38 glue_spec, 8 attribute_list, 2 temp
mkiv lua stats > node list callback tasks: 6 unique task lists, 5 instances (re)created, 32 calls
mkiv lua stats > used backend: pdf (backend for directly generating pdf output)mkiv lua stats > jobdata time: 0.001 seconds saving, 0.000 seconds loading
mkiv lua stats > callbacks: 136 direct, 244 indirect, 380 total
mkiv lua stats > randomizer: initialized with value 0.1895933152128
mkiv lua stats > loaded patterns: en::2, load time: 0.000
mkiv lua stats > result saved in file: ntg62.pdf, compresslevel 3, objectcompresslevel 3
mkiv lua stats > loaded fonts: 2 files: latinmodern-math.otf, lmroman12-regular.otf
mkiv lua stats > font engine: otf 3.020, afm 1.512, tfm 1.000, 4 instances, load time 0.209 seconds
mkiv lua stats > used platform: linux-64, type: unix, binary subtree: bin
mkiv lua stats > luatex banner: this is luatex, version 0.95.0 (tex live 2016)mkiv lua stats > control sequences: 43813 of 65536 + 100000
mkiv lua stats > lua properties: engine: lua, used memory: 72 MB (ctx: 71 MB), hash type: lua, hash chars: min(64,40), symbol mask: utf (τεχ)
mkiv lua stats > runtime: 0.608 seconds, 1 processed pages, 1 shipped pages, 1.645 pages/second

system          | total runtime: 0.849 seconds

TeX Output finished at Mon Oct 31 09:57:37

2016-10-30 14:38 GMT+01:00 Tobias Berndt <tobiasberndt@arcor.de>:

Ok, your problem is more auctex than ConTeXt. So, try this:

(1) Add to .emacs:

;; SERVER Download (MELPA):
(when (>= emacs-major-version 24)
(require 'package)
(add-to-list
'package-archives
'("melpa" . "http://melpa.org/packages/")
t)
(package-initialize))

to get connection to MELPA server.

(2) Save .emacs and start Emacs again
(3) Open OPTIONS—MANAGE EMACS PACKAGES
(4) Install current auctex version
(5) Restart Emacs
(6) Get into context-mode (M-x context-mode)
(7) Type M-x customize-variable RET ConTeXt-Mark-version RET

+++
If Emacs responds: Wrong type argument: symbolp, „string“ (that’s the bug) open context.el (somewhere in .emacs.d/(m)elpa/auctex-11.89.X) and replace line 501 (or nearby)

:type "string"

with

:type 'string

and recompile the file with `M-x byte-compile file RET RET’.
+++

(8) Switch from Mark II to Mark IV

Now, Emacs should generally provide support to ConTeXt Mark IV. To compile tex-files comfortable right out of Emacs via C-c C-c add:

(9) (setenv "PATH" "/home/fab/tex/texmf-linux-64/bin/:$PATH" t) to your .emacs and
(10) (setq ConTeXt-Mark-version "IV“) if you want
(11) Save file and restart Emacs
(12) Open a context file and try out

ALOHA, tobber

> Am 30.10.2016 um 13:30 schrieb Fabrice Couvreur <fabrice1.couvreur@gmail.com>:
>
> Hi Tobias,
>
> (2) Possible completions are:
> ConTeXt-close-environment ConTeXt-close-xml-tag
> ConTeXt-environment ConTeXt-etexshow
> ConTeXt-find-matching-start ConTeXt-find-matching-stop
> ConTeXt-insert-item ConTeXt-mark-environment
> ConTeXt-mode ConTeXt-mode-command-menu
> ConTeXt-mode-menu ConTeXt-section
> ConTeXt-work-on-environment
>
> I added in .emacs
>
> (custom-set-variables
> '(ConTeXt-Mark-version "IV"))
>
> update auctex
>
> How ? Auctex installed with ELPA
>
> (setenv „PATH" „/home/fab/tex/texmf-linux-64/bin/:$PATH" t)
>
> I do not understand this symbol „ and how to access
>
> Thanks
> Fabrice
>
>
> 2016-10-30 12:15 GMT+01:00 Tobias Berndt <tobiasberndt@arcor.de>:
> @ Fabrice: If you’re working under a Linux, use „home“ instead of „Users“ (I’m under macOS, therefore I left „Users“) and forget about the add-to-list line. So:
>
> (1) M-x context-mode
> (2) M-x ConTeXt-Mark-version (switch to mkIV)
>
> If there is no such command: update auctex; if this gives an error (there was/is a bug:) tell me and I’ll give you an instruction how to manipulate your context.el
>
> (3) Add to .emacs: (setenv „PATH“ „/home/fab/tex/texmf-linux-64/bin/:$PATH“ t)
> (4) ;; (add-to-list 'load-path "/home/fab/context/tex/texmf-linux-64/bin/context“)
> (5) Restart Emacs
>
> C-c C-c should work, now.
>
>
> ALOHA, tobber
>
>
>
>
>
>
> > Am 29.10.2016 um 23:41 schrieb Fabrice Couvreur <fabrice1.couvreur@gmail.com>:
> >
> > Hi,
> > @Tobias
> >
> > If I add this to my .emacs I get
> >
> > (setenv "PATH"/Users/fab/tex/texmf-linux-64/bin/ ":$PATH" t)
> > (add-to-list 'load-path "/home/fab/context/tex/texmf-linux-64/bin/context")
> >
> > Warning (initialization): An error occurred while loading `/home/fab/.emacs':
> >
> > Symbol's value as variable is void: /Users/fab/tex/texmf-linux-64/bin
> >
> >
> > @Michael
> >
> > fab@debian:~$ which context
> > /home/fab/bin/context
> > fab@debian:~$ source context/tex/setuptex
> > Setting "/home/fab/context/tex" as ConTeXt root.
> > fab@debian:~$ which context
> > /home/fab/context/tex/texmf-linux-64/bin/context
> > fab@debian:~$
> >
> > If I add this to my .emacs is always texlive 2016 is invoked when I compile
> >
> > (eval-after-load "tex"
> > '(add-to-list 'TeX-command-list
> > '("context"
> > "(/home/fab/context)/setuptex&&context"
> > TeX-run-TeX
> > nil
> > (context-mode)
> > :help "Run ConTeXt") t))
> >
> >
> > Thanks,
> > Fabrice
> >
> >
> > 2016-10-29 12:50 GMT+02:00 Michael Eidenbenz <eidenbenz@arch.ethz.ch>:
> > sorry that should be:
> >
> > (path to textree)/setuptex && context .....
> >
> >
> >>
> >> cd (path to textree) && setuptex && context etc...
> >
> >
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive : https://bitbucket.org/phg/context-mirror/commits/
> > wiki : http://contextgarden.net
> > ___________________________________________________________________________________
> >
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive : https://bitbucket.org/phg/context-mirror/commits/
> > wiki : http://contextgarden.net
> > ___________________________________________________________________________________
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> archive : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> archive : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________