So that I would remember

Add these to the <trac_env_dir>/conf/trac.ini

[components]
tracext.git.* = enabled
tracopt.ticket.commit_updater.committicketreferencemacro = enabled
tracopt.ticket.commit_updater.committicketupdater = enabled
mastertickets.* = enabled

After which, run the command:

trac-admin [path/to/trac] upgrade

This will upgrade the trac and install all the necessary modules