Homebrew is a package manager for macOS. You can use it to install the Arm GCC toolchain
New versions Arm GCC toolchain are available from the gcc-arm-embedded cask, using the following instructions.
brew install --cask gcc-arm-embedded
If you still want to install from this tap, use the following instructions:
brew tap ArmMbed/homebrew-formulae
brew install arm-none-eabi-gcc
This tap was maintained by the Arm Mbed team, not the Arm OSS compiler team! Please raise issues with this formula here, and issues with the toolchain here.