The TeX distribution can be found in /n/sources/extra/tex.iso.bz2

This is a TeX distribution that uses the kpathsearch modifications; the main library tree is kept in /sys/lib/texmf.

• The ps driver (the default) generates Postscript files with references to the Postscript versions of any TeX fonts. These fonts are kept in subdirectories of /sys/lib/postscript/font. The files are small, are generated quickly, and work well with page(1) and lp(8), but since the Postscript versions of the TeX fonts are not commonly installed elsewhere, they are not particularly good for giving to friends or posting on web pages.
• The psfonts driver generates Postscript files with reference to the Postscript versions of the TeX fonts, and also includes the fonts in the Postscript file. The files are fairly large, generated quickly, and are attractive when viewed in Postscript previewers or turned into PDF via Acrobat Distiller.
• The bitmapfonts driver is equivalent to the default on most dvips systems. Bitmap versions of the TeX fonts are included in the output files, making them larger than `ps' but smaller than `psfonts' files, slow to generate, and not particularly attractive when viewed on screen.

cd /sys/src/cmd/tex/web2c/tex
rm *.fmt
mk install-fmt