../gthumb-3.12.2/gthumb/gth-browser.c:2460:7: warning:
using integer absolute value function 'abs' when argument is of floating point type [-Wabsolute-value]

Index: gthumb/gth-browser.c
--- gthumb/gth-browser.c.orig
+++ gthumb/gth-browser.c
@@ -2457,8 +2457,8 @@ viewer_motion_notify_event_cb (GtkWidget      *widget,
 	if (browser->priv->last_mouse_y == 0.0)
 		browser->priv->last_mouse_y = event->y;
 
-	if ((abs (browser->priv->last_mouse_x - event->x) > MOTION_THRESHOLD)
-	    || (abs (browser->priv->last_mouse_y - event->y) > MOTION_THRESHOLD))
+	if ((fabs (browser->priv->last_mouse_x - event->x) > MOTION_THRESHOLD)
+	    || (fabs (browser->priv->last_mouse_y - event->y) > MOTION_THRESHOLD))
 	{
 		if (! browser->priv->pointer_visible) {
 			browser->priv->pointer_visible = TRUE;