Unable to successfully run `brew install redox-os/gcc_cross_compilers/x86_64-elf-gcc`

Hey Redox team, I'm unable to complete the bootstrapping phase (./bootstrap.sh -d). I've narrowed it down to this command:

brew install redox-os/gcc_cross_compilers/x86_64-elf-gcc

I've attached a picture of the error.

Thank you! I look forward to learning and contributing.