Dear all, Finally, luatools is working(gwTeX, Mac OSX 10.4). Following the instruction given by Thomas, I succeeded to run 'luatools --generate' but I got an error when I run 'luatools --ini --compile --verbose cont-en'. There is a memory problem for the languages. Following the suggestion, I add a line 'trie_size = 400000' at the end of texmf.cnf in the folder /usr/local/gwTeX/texmf.cnf. After that 'luatools --ini --compile --verbose cont-en' is running without error and the format file is created in the folder /tmp/ luatex-cache/context/... I test it using a simple file like \starttext some texts \startlua a = 1.5 b = 1.8 c = a*b tex.print(c) \stoplua \stoptext and it was working nicely. But when I tested a sample file in the wiki, \usetypescript[palatino] \setupbodyfont[palatino,12pt] \starttext effe fietsen 2: \input tufte $\sqrt{2}$ \eogonek \sc effe fietsen 2: \input tufte $\sqrt{2}$ \eogonek \stoptext I got a fatal error. Here are some lines in log file. ......... (/usr/local/gwTeX/texmf.pkgs/tex/context/base/type-siz.tex) (/usr/ local/gwTeX/texmf.pkgs/tex/context/base/type-otf.tex) (/usr/local/ gwTeX/texmf.pkgs/tex/context/base/type-tmf.tex) (/usr/local/gwTeX/ texmf.pkgs/tex/context/base/type-siz.tex ! TeX capacity exceeded, sorry [parameter stack size=60]. \donormalizedbodyfontsize #1.#2#3#4\to #5-> \edef #5{#1\ifcase \fontdigits \o... \docommand ...\scratchdimen \to \tempbodyfontsize \setevalue {\??ft \fontcla... \next7 #1,->\docommand {#1} \doprocesscommaitem <argument> \relax text, script,scriptscript,x,xx,big,small \doprocesscommalist ...aitem \gobbleoneargument #1 ,]\relax \global \advance ... <argument> ...acommand [\fontsizelist ]\docommand \copyparameters [\??ft \fo... ... l.22 \stoptypescript node memory in use: 1601 words out of 100604 (98904 untouched) currently available: 1:3, 2:9, 3:3, 4:7, 6:4, 8:2 nodes ! ==> Fatal error occurred, no output PDF file produced! Would you please tell me what is wrong here? Thank you. Best regards, Dalyoung