You need Git and Whalesong installed on your computer to install this plugin. Checkout Whalesong documention for instructions on how to install it. To install plugin -

1. Clone the plugin git repository

    $ git clone git@github.com:vishesh/drracket-whalesong.git 
   

2. Change directory to cloned repository, and install the plugin using raco

    $ cd /path/to/drracket-whalesong
    $ raco pkg install