--- -	2005-10-30 18:00:07.118216000 -0700
+++ xc/programs/Xserver/hw/xfree86/input/evdev/evdev.c	2005-10-30 17:59:48.846616088 -0700
@@ -155,6 +155,13 @@ EvdevReadInput(InputInfoPtr pInfo)
                     PostButtonClicks(pInfo, wheel_down_button, -value);
                 break;
 
+	    case REL_Z:
+                if (value > 0)
+                    PostButtonClicks(pInfo, wheel_left_button, value);
+                if (value < 0)
+                    PostButtonClicks(pInfo, wheel_right_button, -value);
+                break;
+
             case REL_HWHEEL:
                 if (value > 0)
                     PostButtonClicks(pInfo, wheel_right_button, value);