unzipped Ruby 3.4.7 into the appropriate place (third-party) in the repo and explained what i wanted (it used the Lua and Python port for reference)

first it built the Cosmo Make tooling integration and then we (ha "we" !) started iterating and iterating compiling Ruby with the Cosmo compiler … every time we hit some snag Claude Code would figure it out

I would have completed it sooner but I kept hitting the 5 hourly session token limits on my Pro account

https://github.com/igravious/cosmoruby

Looks like this is the relevant code https://github.com/jart/cosmopolitan/compare/master...igravi...