Getting feOS running as a developer:

1. Clone this repo.
2. CD into your new folder.
3. Install cargo AND rustup.
4. rustup override set nightly
5. cargo build --target x86_64-feos.json

If that doesn't work you'll have to add it to Rust itself.

1. rustup target add x86_64-feos

2. Then try cargo build --target x86_64-feos.json

3. Now this works, do cargo build to build and cargo run and cargo test respectively.