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/usr/include/sigc++-2.0/sigc++/retype.h is in libsigc++-2.0-dev 2.2.10-0.2ubuntu2.

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// -*- c++ -*-
/* Do not edit! -- generated file */
#ifndef _SIGC_MACROS_RETYPEHM4_
#define _SIGC_MACROS_RETYPEHM4_
#include <sigc++/adaptors/adaptor_trait.h>
#include <sigc++/slot.h>

#endif /* _SIGC_MACROS_RETYPEHM4_ */