IIRC, at the time, building on DOS w/djgpp was fully supported since leJOS is designed to be fairly OS independent. There's not much room for an OS in the Lego

IIRC, at the time, building on DOS w/djgpp was fully supported since leJOS is designed to be fairly OS independent. There's not much room for an OS in the Lego Mindstorms MCU. You can think of it a bit like how people today build minimal Rust or Go-lang OS experiments.