Cannot install rails-widgets

[zahidal]

I don't have git client installed in my machine. I am trying to
install rails-widgets plugins using following command:

ruby plugin install http://github.com/paolodona/rails-widgets

But i am getting Plugin not found error. I have tried following
command also but same result:

ruby plugin install svn://svn.seesaw.it/widgets/trunk

Can someone please help me what I am missing?

Thanks