How to run the Homebrew installer under Rosetta 2 on M1 Macbook

macos homebrew apple-m1 apple-silicon rosetta-2
Watson picture Watson · Nov 17, 2020 · Viewed 71.7k times · Source

I'm on the M1 MacBook. This is the error when I try to install Homebrew:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Homebrew is not (yet) supported on ARM processors!
Rerun the Homebrew installer under Rosetta 2.
If you really know what you are doing and are prepared for a very broken experience you can use another installation option for installing on ARM:
  https://docs.brew.sh/Installation

So how do I "Rerun the Homebrew installer under Rosetta 2."?

Answer

Watson picture Watson · Nov 17, 2020

Got an answer from a developer in the Homebrew github https://github.com/Homebrew/brew/issues/9173

arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Use this to install packages:

arch -x86_64 brew install <package>

If you have not yet installed Rosetta 2 to emulate Intel CPUs on ARM Macs, you will get the error arch: posix_spawnp: /bin/bash: Bad CPU type in executable. Prompt a Rosetta 2 installation with:

softwareupdate --install-rosetta

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