Mine is also in LaTeX. Every 3-5 years I get a nice reminder of the nightmare that is cobbling together a fully functional LaTeX dev environment to work on it again.
Sometimes you get lucky and everything just works. If it doesn't... you google it, and pray that someone else hit the same problem and solved it, because trying to actually figure out the problem from first principles is doomed -- the language (and ecosystem) makes Perl look sane.