Stuff that happened to me when migrating to an M1 Mac

fixes.sh

# The macOS command line tools broke, so I had to reinstall them
# (I kept getting the error "Your CLT does not support macOS 11."
#  when compiling packages from Homebrew.)
sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install

# Homebrew had old x86 libraries and object files and god knows what
# else hanging around, which caused several packages to break during install
# (including Ruby) so I reinstalled Homebrew and all my packages
brew list > ~/homebrew.tmp.txt
rm -rf /usr/local/{Homebrew,bin,etc,include,lib,libexec,opt,sbin,share,var}
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
for package in $(cat ~/homebrew.tmp.txt); do brew install "$package"; done

# I recompiled Ruby once I had iTerm + my shell running on arm
rvm reinstall 3.0.0

# The system default Python is really old, so I installed pyenv + 3.9.1
brew install pyenv
pyenv install 3.9.1
pyenv global 3.9.1