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diff --git a/lily/pointer-group-interface-scheme.cc b/lily/pointer-group-interface-scheme.cc
new file mode 100644
index 0000000000..53fe7b2097
--- /dev/null
+++ b/lily/pointer-group-interface-scheme.cc
@@ -0,0 +1,36 @@
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2010--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "pointer-group-interface.hh"
+#include "grob.hh"
+
+LY_DEFINE (ly_pointer_group_interface__add_grob, "ly:pointer-group-interface::add-grob",
+	   3, 0, 0, (SCM grob, SCM sym, SCM grob_element),
+	   "Add @var{grob-element} to @var{grob}'s @var{sym} grob array.")
+{
+  LY_ASSERT_TYPE (unsmob_grob, grob, 1);
+  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
+  LY_ASSERT_TYPE (unsmob_grob, grob_element, 3);
+
+  Pointer_group_interface::add_grob (unsmob_grob (grob),
+				     sym,
+				     unsmob_grob (grob_element));
+  return SCM_UNSPECIFIED;
+}
+