(I'm just) thinking out loud

xmpp4r gem jid = Jabber::JID::new('admin@ejabberd.server.com/res') client = Jabber::Client::new(jid) client.connect client.auth("admin_password") iqr = Jabber::Iq.new(:set) qr = Jabber::IqQuery.new qr.add_namespace('jabber:iq:register') username = 'nishant' password = 'nishant' qr.add(REXML::Element.new('username').add_text(username)) qr.add(REXML::Element.new('password').add_text(password)) iqr.add(qr) client.send iqr

Before installing  Imagemagick  in your system. Make sure you have these dependencies installed 1) PNG library - development libpng12-dev 2) Independent JPEG Group's JPEG runtime library (dependency package) libjpeg8 You can install these dependencies using Ubuntu Software Center.