Install toolchain

mkdir ~/esp32

cd ~/esp32

wget https://dl.espressif.com/dl/xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz

tar xvfz xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz

rm *.gz

Add toolchain to your path

vi ~/.profile

export PATH=$PATH:$HOME/esp32/xtensa-esp32-elf/bin

Install ESP-IDF

cd ~/esp32

Add IDF_PATH environment variable

vi ~/.profile

export IDF_PATH=~/esp32/esp-idf

Reference	URL
Setup Toolchain on Mac	https://docs.espressif.com/projects/esp-idf/en/stable/get-started/macos-setup.html
Install IDF	https://docs.espressif.com/projects/esp-idf/en/stable/get-started/index.html#get-started-get-esp-idf