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diff --git a/indra/viewer_components/updater/llupdatechecker.h b/indra/viewer_components/updater/llupdatechecker.h
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+++ b/indra/viewer_components/updater/llupdatechecker.h
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+/** 
+ * @file llupdatechecker.h
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_UPDATERCHECKER_H
+#define LL_UPDATERCHECKER_H
+
+
+#include <boost/shared_ptr.hpp>
+
+
+//
+// Implements asynchronous checking for updates.
+//
+class LLUpdateChecker {
+public:
+	class Client;
+	class Implementation;
+	
+	// An exception that may be raised on check errors.
+	class CheckError;
+	
+	LLUpdateChecker(Client & client);
+	
+	// Check status of current app on the given host for the channel and version provided.
+	void check(std::string const & protocolVersion, std::string const & hostUrl, 
+			   std::string const & servicePath, std::string channel, std::string version);
+	
+private:
+	boost::shared_ptr<Implementation> mImplementation;
+};
+
+
+class LLURI; // From lluri.h
+
+
+//
+// The client interface implemented by a requestor checking for an update.
+//
+class LLUpdateChecker::Client
+{
+public:
+	// An error occurred while checking for an update.
+	virtual void error(std::string const & message) = 0;
+	
+	// A newer version is available, but the current version may still be used.
+	virtual void optionalUpdate(std::string const & newVersion,
+								LLURI const & uri,
+								std::string const & hash) = 0;
+	
+	// A newer version is available, and the current version is no longer valid. 
+	virtual void requiredUpdate(std::string const & newVersion,
+								LLURI const & uri,
+								std::string const & hash) = 0;
+	
+	// The checked version is up to date; no newer version exists.
+	virtual void upToDate(void) = 0;
+};
+
+
+#endif