homebrew-grub
Homebrew tap for installing GNU GRUB.
Note that this currently only works for the x86_64-pc-elf target and the HEAD version of GRUB; e.g.:
brew install --with-x86_64-pc-elf --HEAD
Support for fixed versions and other targets is coming soon.
Building GRUB for x86_64-pc-elf requires the gcc and GNU binutils toolchain for that target, which is available in my tap.