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diff --git a/source/blender/depsgraph/util/depsgraph_util_pchanmap.h b/source/blender/depsgraph/util/depsgraph_util_pchanmap.h
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+++ b/source/blender/depsgraph/util/depsgraph_util_pchanmap.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2015 Blender Foundation.
+ * All rights reserved.
+ *
+ * Original Author: Sergey Sharybin
+ * Contributor(s): Joshua Leung
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/depsgraph/util/depsgraph_util_pchanmap.h
+ *  \ingroup depsgraph
+ */
+
+#ifndef __DEPSGRAPH_UTIL_PCHANMAP_H__
+#define __DEPSGRAPH_UTIL_PCHANMAP_H__
+
+struct RootPChanMap {
+	/* ctor and dtor - Create and free the internal map respectively. */
+	RootPChanMap();
+	~RootPChanMap();
+
+	/* Debug contents of map. */
+	void print_debug();
+
+	/* Add a mapping. */
+	void add_bone(const char *bone, const char *root);
+
+	/* Check if there's a common root bone between two bones. */
+	bool has_common_root(const char *bone1, const char *bone2);
+
+private:
+	/* The actual map:
+	 * - Keys are "strings" (const char *) - not dynamically allocated.
+	 * - Values are "sets" (const char *) - not dynamically allocated.
+	 *
+	 * We don't use the C++ maps here, as it's more convenient to use
+	 * Blender's GHash and be able to compare by-value instead of by-ref.
+	 */
+	struct GHash *m_map;
+};
+
+#endif  /* __DEPSGRAPH_UTIL_PCHANMAP_H__ */