Jonsykkel’s Pest “station” was written in **C**.

You’ll see it referenced in the logs:

- The log link `http://zzz.st/code/smalpest/tree/src/utf8.c` points to a C source file for his station implementation.
- He talks about building and running the station with C‑based code (e.g., “smalpest” is a C project).

So, if you’re looking to dig into or compile Jonsykkel’s Pest station, start with the C codebase.