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/usr/include/gsl/gsl_block.h is in libgsl-dev 2.1+dfsg-2.

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#ifndef __GSL_BLOCK_H__
#define __GSL_BLOCK_H__

#include <gsl/gsl_block_complex_long_double.h>
#include <gsl/gsl_block_complex_double.h>
#include <gsl/gsl_block_complex_float.h>

#include <gsl/gsl_block_long_double.h>
#include <gsl/gsl_block_double.h>
#include <gsl/gsl_block_float.h>

#include <gsl/gsl_block_ulong.h>
#include <gsl/gsl_block_long.h>

#include <gsl/gsl_block_uint.h>
#include <gsl/gsl_block_int.h>

#include <gsl/gsl_block_ushort.h>
#include <gsl/gsl_block_short.h>

#include <gsl/gsl_block_uchar.h>
#include <gsl/gsl_block_char.h>

#endif /* __GSL_BLOCK_H__ */