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Homebrew

Prerequisites

You should not already have homebrew installed. If you do:

  1. Make sure you have a backup.
  2. Uninstall any homebrew you have installed. Use the homebrew uninstaller, and delete directories.
  3. Also check your ~/.zshrc for any brew aliases or other tricks.

You do not need a Rosetta Terminal.

Instructions

We install brew in x86 mode. Type this command in Terminal:

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

This installs brew in its regular location.

To make sure that the brew command and the installed packages can be found, I change my PATH in ~/.zshrc.

# Add my /usr/local/bin to PATH
# This also contains Homebrew's `brew` command in x86 arch
export PATH="/usr/local/bin:$PATH"

# My personal scripts come first
export PATH="$HOME/bin:$PATH"

Notice that personal scripts in the bin folder in my home directory have priority over the brew command and Homebrew packages. This is important.

Now I want to make sure that brew is always called in x86 mode. You can do this by forcing the entire Terminal app, or by making an alias, but I will take a different approach and use a small script. This script will also help us to make brew place nice with pyenv.

Create a file ~/bin/brew with the following content:

#!/bin/sh
# Assumes default location of brew in `/usr/local/bin/brew`
arch -x86_64 /usr/local/bin/brew "$@"

Make this file executable

chmod gu+rx ~/bin/brew

Now every time we call the brew command, this script will prefix it with the arch -x86_64 command to make sure it runs in x86 mode.

Type brew doctor to confirm. You see this result:

brew doctor
Your system is ready to brew.

If brew doctor says anything else, be sure to follow up. A common issue is fixing the permissions for several folders.

We're done, we now have Homebrew installed in x86 mode.