Emacs 24 kill-region and yank

To restore the old kill-region and yank behaviour, add the following to .emacs:

(setq x-select-enable-clipboard nil)
(setq x-select-enable-primary t) 
(setq  mouse-drag-copy-region t)
(setq select-active-regions nil)
(global-set-key [mouse-2] 'mouse-yank-at-click)