Red Bear OS
3cc7ed909c
Rust nightly requires -Zunstable-options for custom target JSON specs (such as x86-unknown-none.json). Without it, the build fails with: error: error loading target specification: custom targets are unstable and require `-Zunstable-options` UEFI already uses the built-in x86_64-unknown-uefi target, so it didn't need this flag. The kernel recipe already has this fix; the bootloader BIOS Makefile was missing it.