How do you install Crosh?

How do you install Crosh?
Overview

Boot the machine and go to a shell (login and go to crosh (ctrl+alt+t) or change to virtual terminal 2 (CTRL+ALT+F2))
Change to root and initialize the login environment variables: $ sudo su –
Execute the dev_install script.
Use emerge as usual.
Done!

Overview
  1. Boot the machine and go to a shell (login and go to crosh (ctrl+alt+t) or change to virtual terminal 2 (CTRL+ALT+F2))
  2. Change to root and initialize the login environment variables: $ sudo su –
  3. Execute the dev_install script.
  4. Use emerge as usual.
  5. Done!