Kpathsea

Kpathsea is a library to do path searching. It is used in the Web2C implementation of TeX and friends.

Read the Kpathsea manual.
Join the mailing list and/or browse/search the mailing list archives.
Peruse the sources. Kpathsea is maintained as part of the TeX Live distribution. It has never been distributed as a standalone library, though some distros have deployed it that way.

$Date: 2008/05/04 18:49:53 $;