diff -uprb easystroke-0.6.0.orig/actions.cc easystroke-0.6.0/actions.cc
--- easystroke-0.6.0.orig/actions.cc	2013-03-27 17:52:38.000000000 +0200
+++ easystroke-0.6.0/actions.cc	2015-12-07 22:07:17.720041171 +0200
@@ -51,10 +51,11 @@ void TreeViewMulti::on_drag_begin(const
 	context->set_icon(pb, pb->get_width(), pb->get_height());
 }
 
-bool negate(bool b) { return !b; }
-
 TreeViewMulti::TreeViewMulti() : Gtk::TreeView(), pending(false) {
-	get_selection()->set_select_function(sigc::group(&negate, sigc::ref(pending)));
+	get_selection()->set_select_function(
+		[this](Glib::RefPtr<Gtk::TreeModel> const&, Gtk::TreeModel::Path const&, bool) {
+			return !pending;
+		});
 }
 
 enum Type { COMMAND, KEY, TEXT, SCROLL, IGNORE, BUTTON, MISC };