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diff --git a/src/util/lemma_output_channel.h b/src/util/lemma_output_channel.h
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-/*********************                                                        */
-/*! \file lemma_output_channel.h
- ** \verbatim
- ** Original author: Morgan Deters
- ** Major contributors: none
- ** Minor contributors (to current version): none
- ** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2014  New York University and The University of Iowa
- ** See the file COPYING in the top-level source directory for licensing
- ** information.\endverbatim
- **
- ** \brief Mechanism for communication about new lemmas
- **
- ** This file defines an interface for use by the theory and propositional
- ** engines to communicate new lemmas to the "outside world," for example
- ** for lemma sharing between threads.
- **/
-
-#include "cvc4_public.h"
-
-#ifndef __CVC4__LEMMA_OUTPUT_CHANNEL_H
-#define __CVC4__LEMMA_OUTPUT_CHANNEL_H
-
-#include "expr/expr.h"
-
-namespace CVC4 {
-
-/**
- * This interface describes a mechanism for the propositional and theory
- * engines to communicate with the "outside world" about new lemmas being
- * discovered.
- */
-class CVC4_PUBLIC LemmaOutputChannel {
-public:
-  virtual ~LemmaOutputChannel() throw() { }
-
-  /**
-   * Notifies this output channel that there's a new lemma.
-   * The lemma may or may not be in CNF.
-   */
-  virtual void notifyNewLemma(Expr lemma) = 0;
-};/* class LemmaOutputChannel */
-
-}/* CVC4 namespace */
-
-#endif /* __CVC4__LEMMA_OUTPUT_CHANNEL_H */