SlackBuilds.org/development/vispatch

VisPatch is a tool for patching quake maps for transparent water in
glquake. Original quake didn't have their maps water-vis'ed, so people
did that by themselves and prepared patch data files. This tool is used
for preparing and applying those patch files.

At the time this tool was written, re-vis'ing maps took a lot of time, but
applying a vispatch took less than minutes, so this was a necessity. Even
today, if people don't want going into a 'complex' job of vising, this
tool comes as a great convenience because there are a lot of vispatch
data files around.

This is a revised version of Andy Bay's 1.2a source code for unix (linux,
freebsd, ...), as well as windows. It fixes a number of compilation
issues, crashes and some other bugs, and resolves endianness issues. The
source code is licensed under GPLv2, and is maintained here with
portability in mind.