Hi,
texvc is a OCaml program that generates PNG images for the Math extension. Packages for Debian and Ubuntu are now available, please see https://www.mediawiki.org/wiki/User:Legoktm/Packages/texvc for more details.
This package is useful regardless of whether you are using the mediawiki package or not - it allows you to use texvc without needing to install the full OCaml toolchain to build it manually.
Finally, in the long term the Math extension maintainers would like to phase out texvc in favor of the mathoid-based code. If you do use texvc (packaged or not), your comments on https://phabricator.wikimedia.org/T155201 would be appreciated.
-- Legoktm