$OpenBSD: patch-rtgui_tonecurve_cc,v 1.1 2015/09/29 09:02:21 ajacoutot Exp $

Fix build with libsigc++ >= 2.6

--- rtgui/tonecurve.cc.orig	Tue Sep 29 10:22:44 2015
+++ rtgui/tonecurve.cc	Tue Sep 29 10:22:47 2015
@@ -18,7 +18,6 @@
  */
 #include "tonecurve.h"
 #include "adjuster.h"
-#include <sigc++/class_slot.h>
 #include <iomanip>
 #include "ppversion.h"
 #include "edit.h"
