Hello, Sorry to insist, but could anyone help me understand the problem I'm having in using Emacs with standalone context ? The following file compiles perfectly from a terminal : /home/aragorn/texlive/2018/bin/x86_64-linux/context test.tex /home/aragorn/context/tex/texmf-linux-64/bin/context test.tex (latest beta) With Emacs, it compiles perfectly if you use the 2018 texlive context binary. If I want to use the latest beta context binary, I need to add this to my ~/.emacs file : (setenv "PATH" "/home/aragorn/context/tex/texmf-linux-64/bin/:$PATH" t) And there, I encounter a compilation problem : Running `ConTeXt Full' on `pouf' with ``context --purgeall --nonstop pouf.tex''resolvers | trees | analyzing 'home:texmf' mtx-context | run 1: luatex --fmt="/home/aragorn/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en" --interaction="nonstopmode" --jobname="pouf" --lua="/home/aragorn/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --no-parse-first-line --c:currentrun=1 --c:fulljobname="./pouf.tex" --c:input="./pouf.tex" --c:kindofrun=1 --c:maxnofruns=9 --c:nonstopmode --c:purgeall "cont-yes.mkiv" This is LuaTeX, Version 1.08.0 (TeX Live 2018) system commands enabled. resolvers > trees > analyzing 'home:texmf' open source > level 1, order 1, name '/home/aragorn/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv' job > passes > version mismatch: 1.3 <> 1.31 system > system > ConTeXt ver: 2018.08.20 17:47 MKIV beta fmt: 2018.8.20 int: english/english system > system > 'cont-new.mkiv' loaded open source > level 2, order 2, name '/home/aragorn/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv' system > beware: some patches loaded from cont-new.mkiv close source > level 2, order 2, name '/home/aragorn/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv' system > files > jobname 'pouf', input './pouf', result 'pouf' fonts > latin modern fonts are not preloaded languages > language 'en' is active open source > level 2, order 3, name '/home/aragorn/pouf.tex' fonts > preloading latin modern fonts (second stage) fonts > 'fallback modern-designsize rm 12pt' is loaded structure > sectioning > chapter @ level 2 : 0.1 -> First chapter metapost > initializing instance 'metafun:1' using format 'metafun' and method 'default' metapost > loading 'metafun' as '/home/aragorn/context/tex/texmf-context/metapost/context/base/mpiv/metafun.mpiv' using method 'default' metapost > initializing number mode 'scaled' lua error > lua error on line 10 in file /home/aragorn/pouf.tex: ...ext/tex/texmf-context/tex/context/base/mkiv/node-nut.lua:190: attempt to call a nil value (global 'getid') stack traceback: ...ext/tex/texmf-context/tex/context/base/mkiv/node-nut.lua:190: in upvalue 'getexpansion' ...ext/tex/texmf-context/tex/context/base/mkiv/font-mps.lua:343: in function <...ext/tex/texmf-context/tex/context/base/mkiv/font-mps.lua:338> ...ext/tex/texmf-context/tex/context/base/mkiv/font-mps.lua:437: in local 'boxtomp' ...ext/tex/texmf-context/tex/context/base/mkiv/mlib-pps.lua:1894: in function <...ext/tex/texmf-context/tex/context/base/mkiv/mlib-pps.lua:1891> (...tail calls...) 1 2 \startusableMPgraphic{NumberHead} 3 draw outlinetext.f 4 ("\bf\namedheadnumber{chapter}") 5 (withcolor "lightgray") 6 ysized 50pt ; 7 \stopusableMPgraphic 8 9 \unexpanded\def\processMPheadnumber#1% 10 >> {\useMPgraphic{NumberHead}} 11 12 \setuphead 13 [chapter] 14 [command=\HeadTitle, 15 headstyle=\ss, 16 numbercommand=\processMPheadnumber, 17 ] 18 19 20 \unexpanded\def\HeadTitle#1#2% open source > level 3, order 4, name '/home/aragorn/context/tex/texmf-context/tex/context/sample/common/ward.tex' close source > level 3, order 4, name '/home/aragorn/context/tex/texmf-context/tex/context/sample/common/ward.tex' backend > xmp > using file '/home/aragorn/context/tex/texmf-context/tex/context/base/mkiv/lpdf-pdx.xml' pages > flushing realpage 1, userpage 1, subpage 1 close source > level 2, order 4, name '/home/aragorn/pouf.tex' close source > level 1, order 4, name '/home/aragorn/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv' mkiv lua stats > used config file: selfautoparent:/texmf/web2c/texmfcnf.lua mkiv lua stats > used cache path: /home/aragorn/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e mkiv lua stats > resource resolver: loadtime 0.007 seconds, 1 scans with scantime 0.000 seconds, 0 shared scans, 31 found files, scanned paths: /home/aragorn/texmf mkiv lua stats > stored bytecode data: 437 modules (0.226 sec), 93 tables (0.015 sec), 530 chunks (0.241 sec) mkiv lua stats > traced context: maxstack: 1328, freed: 5, unreachable: 1323 mkiv lua stats > cleaned up reserved nodes: 58 nodes, 9 lists of 455 mkiv lua stats > node memory usage: 2 glue, 2 kern, 2 penalty, 14 attribute, 50 glue_spec, 4 attribute_list, 2 temp, 2 user_defined mkiv lua stats > node list callback tasks: 8 unique task lists, 6 instances (re)created, 55 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: internal: 179, file: 180, direct: 2, late: 1, function 529, total: 891 mkiv lua stats > loaded patterns: en::2, load time: 0.000 mkiv lua stats > result saved in file: pouf.pdf, compresslevel 3, objectcompresslevel 3 mkiv lua stats > loaded fonts: 4 files: latinmodern-math.otf, lmroman10-bold.otf, lmroman10-regular.otf, lmroman12-regular.otf mkiv lua stats > font engine: otf 3.104, afm 1.513, tfm 1.000, 9 instances, 3 shared in backend, 3 common vectors, 0 common hashes, load time 0.238 seconds mkiv lua stats > metapost: 0.001 seconds, loading: 0.018, execution: 0.000, n: 1, average: 0.019, instances: 1, luacalls: 7, memory: 2.608 M mkiv lua stats > used platform: linux-64, type: unix, binary subtree: texmf-linux-64 mkiv lua stats > used engine: luatex version 1.08 with functionality level 6731, banner: this is luatex, version 1.08.0 (tex live 2018) mkiv lua stats > control sequences: 46533 of 65536 + 100000 mkiv lua stats > lua properties: engine: lua 5.3, used memory: 61 MB (ctx: 61 MB), hash type: lua, hash chars: min(64,40), symbol mask: utf (τεχ) mkiv lua stats > runtime: 0.613 seconds, 1 processed pages, 1 shipped pages, 1.631 pages/second mtx-context | fatal error: return code: 1 TeX Output exited abnormally with code 1 at Wed Aug 22 13:01:54 ######## test.tex ######## \startusableMPgraphic{NumberHead} draw outlinetext.f ("\bf\namedheadnumber{chapter}") (withcolor "lightgray") ysized 50pt ; \stopusableMPgraphic \unexpanded\def\processMPheadnumber#1% {\useMPgraphic{NumberHead}} \setuphead [chapter] [command=\HeadTitle, headstyle=\ss, numbercommand=\processMPheadnumber, ] \unexpanded\def\HeadTitle#1#2% {\framed [frame=off, bottomframe=on, width=broad, align={broad,nothyphenated,left}] {#1\blank[nowhite]#2}} \starttext \startchapter[title=First chapter] \input ward \stopchapter \stoptext Thanks Fabrice