# MacOS environment

``` bash
brew tap altkatz/homebrew-gcc_cross_compilers
brew install x64-elf-gcc
```

* x86_64_elf_*:
    <https://github.com/altkatz/homebrew-gcc_cross_compilers>

* grub.rb:
    <https://github.com/nativeos/homebrew-i386-elf-toolchain/blob/master/Formula/i386-elf-grub.rb>

* objconv.rb:
    <https://github.com/hawkw/homebrew-grub/blob/master/Formula/objconv.rb>
    Change SHA256