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/usr/lib/openmpi/include/mpi-ext.h is in libopenmpi-dev 1.6.5-9.1+deb8u1.

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/*
 * $HEADER$
 */

#ifndef OMPI_MPI_EXT_H
#define OMPI_MPI_EXT_H 1

#if defined(c_plusplus) || defined(__cplusplus)
extern "C" {
#endif

#define OMPI_HAVE_MPI_EXT 1


#if defined(c_plusplus) || defined(__cplusplus)
}
#endif

#endif /* OMPI_MPI_EXT_H */