When run latex on next dummy file, it works. \documentclass{report} \title{Description du logiciel} \author{Personne} \begin{document} \maketitle \chapter{Premier chapitre} Essai \end{document} If I add \usepackage[francais]{babel}, it fails like that This is TeX, Version 3.14159 (Web2C 7.3.1) (bug.tex LaTeX2e <1998/12/01> patch level 1 Babel <v3.6x> and hyphenation patterns for american, french, german, ngerman, i talian, nohyphenation, loaded. (/usr/share/texmf/tex/latex/base/report.cls Document Class: report 1999/01/07 v1.4a Standard LaTeX document class (/usr/share/texmf/tex/latex/base/size10.clo)) (/usr/share/texmf/tex/generic/babel/babel.sty (/usr/share/texmf/tex/generic/babel/frenchb.ldf (/usr/share/texmf/tex/generic/babel/babel.def))) (bug.aux) (/usr/share/texmf/tex/latex/ot2cyr/ot2wncyr.fd) ! Undefined control sequence. \add@accent ...l \mathchardef \accent@spacefactor \spacefactor }\accent #1 #... l.5 \begin{document} ?
I cannot reproduce the problem with the following input: \documentclass{report} \usepackage[francais]{babel} \title{Description du logiciel} \author{Personne} \begin{document} \maketitle \chapter{Premier chapitre} Essai \end{document} Here's the output I see: bash$ latex bug This is TeX, Version 3.14159 (Web2C 7.3.1) (bug.tex LaTeX2e <1998/12/01> patch level 1 Babel <v3.6x> and hyphenation patterns for american, french, german, ngerman, i talian, nohyphenation, loaded. (/usr/share/texmf/tex/latex/base/report.cls Document Class: report 1999/01/07 v1.4a Standard LaTeX document class (/usr/share/texmf/tex/latex/base/size10.clo)) (/usr/share/texmf/tex/generic/babel/babel.sty (/usr/share/texmf/tex/generic/babel/frenchb.ldf (/usr/share/texmf/tex/generic/babel/babel.def))) (bug.aux) (/usr/share/texmf/tex/latex/ot2cyr/ot2wncyr.fd) [1] Chapitre 1. [1] (bug.aux) ) Output written on bug.dvi (2 pages, 616 bytes). Transcript written on bug.log. (The above was run on sparc Red Hat 6.1 with tetex-1.0.6-7 installed.)