Dear Thomas, I found the folder /usr/local/Build/powerpc/TeXLive.2006. I remembered that I have tried to install TeX using the source before. When I open terminal, .luatex in not implemented yet and "texexec -- make --all --pdftex" run without any errors. %%%%%%%%%%%%%%%%% texexec --make --all --pdftex TeXExec | using search method 'kpsewhich' TeXExec | updating file database mktexlsr: Updating /usr/local/gwTeX/texmf/ls-R... mktexlsr: Updating /usr/local/gwTeX/texmf.gwtex/ls-R... ... mktexlsr: Done. TeXExec | using tex engine pdftex TeXExec | using tex format path /Users/dalyoung/Library/texmf/web2c/ pdftex TeXExec | generating tex format cont-en This is pdfTeX, Version 3.141592-1.40.3 (Web2C 7.5.6) (INITEX) (/usr/local/gwTeX/texmf.pkgs/web2c/natural.tcx) ... %%%%%%%%%%% As you see in the above output, it uses the searching method 'kpsewhich' and '/usr/local/gwTeX/texmf.pkgs/web2c/natural.tcx' But after running 'source ~/.luatex', it used the same searaching path but different path for format and engine paths as following even though I removed /usr/local/Build folder. However, to run 'luatools --generate', I need to run .luatex. Still, I have a problem in 'luatools --ini --compile...'. %%%%%%%%%%%%%%% texexec --make --all --pdftex TeXExec | using search method 'kpsewhich' TeXExec | updating file database ... TeXExec | using tex engine pdftex TeXExec | using tex format path /usr/local/Build/powerpc/TeXLive.2006/ texmf/web2c/pdftex TeXExec | generating tex format cont-en ... TeXExec | tex engine path: /usr/local/Build/powerpc/TeXLive.2006/ texmf/web2c/pdftex TeXExec | mps engine path: /usr/local/Build/powerpc/TeXLive.2006/ texmf/web2c ... %%%%%%%%%%%% So I think that .luatex change the setting for the ConTeXt. I attached .luatex file which shows the TDS in my mac. By the way, what is 'whence'? It is a unknown cmd in my machine. and how to remove '/usr/local/Build/...' from the engine path? Thank you for your help. Best regards, Dalyoung