As some GUI Sass compiler tools include Susy and some don’t, we will err on the side of caution and install Susy from the command line. Susy is another plugin and like the other Sass and Compass based goodies we have dealt with, they are available as gems that we can install from the command line.
Open up your command-line tool (‘Command Prompt with Ruby’ on Windows, ‘Terminal’ or ‘iTerm’ on OS X) and enter the following command:
gem install susy
Remember if you are running OS X you may need to prefix the command with sudo:
sudo gem install susy
Enter your usual desktop password if prompted and press Enter.
Tip
Remember the command line won’t give you any visual indication that the password is being input, you’ll likely just see the cursor blinking in the same position.
You should see a response like this once installed:
Fetching: susy-1.0.7.gem (100%)
Successfully installed susy-1.0.7
1 gem installed