mac m1 Big Sur ld: library not found for -lSystem

ld: library not found for -lSystem
-> brew reinstall gcc

zsh: command not found brew
-> /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

or

-> cd /opt
-> sudo mkdir homebrew
-> sudo chown -R $(whoami) /opt/homebrew -> curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C homebrew -> echo "export PATH=/opt/homebrew/bin:$PATH" >> ~/.zshrc