installing XV-11 driver git error

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I'm following the directions from here, http://www.ros.org/wiki/xv_11_laser_d... I installed Cturtle and then when I try to install the driver I get this.

linux$ rosinstall ~/cwru-ros-pkg /opt/ros/cturtle 'http://www.ros.org/wiki/xv_11_laser_driver/Tutorials/Running%20the%20XV-11%20Node?action=AttachFile&do=get&target=cwru-ros-pkg.rosinstall' rosinstall operating on /home/ringo/cwru-ros-pkg from specifications in rosinstall files /opt/ros/cturtle, http://www.ros.org/wiki/xv_11_laser_d... processing config_uri /opt/ros/cturtle ERROR: woah, unknown installation method git not installed, cannot create a git vcs client

So do I need to install GIT or is there another way?