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/usr/include/dune/common/unused.hh is in libdune-common-dev 2.2.1-2.

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#ifndef DUNE_COMMON_UNUSED_HH
#define DUNE_COMMON_UNUSED_HH

/** \file
 * \brief Definition of the DUNE_UNUSED macro for the case that config.h
 *      is not available
 */

#ifndef HAS_ATTRIBUTE_UNUSED
#define DUNE_UNUSED
#else
#define DUNE_UNUSED __attribute__((unused))
#endif

#endif