You are reading the README of the superbuild once mantained by the Advanced Robotics department at the Italian Institute of Technology. This superbuild has been renamed advr-superbuild, and it is availble at https://github.com/ADVRHumanoids/advr-superbuild. If instead you are searching for the superbuild mantained by the iCub project (http://iit.it/icub) at the Italian Institute of Technology, also called robotology-superbuild, please check https://github.com/robotology/robotology-superbuild.
This superbuild is currently DEPRECATED and will be removed soon: check https://github.com/ADVRHumanoids/advr-superbuild