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

Fix build with libsigc++ >= 2.6

--- rtgui/preferences.cc.orig	Tue Sep 29 10:21:53 2015
+++ rtgui/preferences.cc	Tue Sep 29 10:21:58 2015
@@ -16,7 +16,6 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
  */
-#include <sigc++/class_slot.h>
 #include "preferences.h"
 #include "multilangmgr.h"
 #include "splash.h"
