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/usr/include/m4ri/m4ri_config.h is in libm4ri-dev 20130416-6.

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#ifndef M4RI_M4RI_CONFIG_H
#define M4RI_M4RI_CONFIG_H

// Defines determined during configuration of m4ri.
#define __M4RI_HAVE_MM_MALLOC		1
#define __M4RI_HAVE_POSIX_MEMALIGN	1
#define __M4RI_HAVE_SSE2		1
#define __M4RI_HAVE_OPENMP		0
#define __M4RI_CPU_L1_CACHE		32768
#define __M4RI_CPU_L2_CACHE		262144
#define __M4RI_CPU_L3_CACHE		12582912
#define __M4RI_DEBUG_DUMP		(0 || 0)
#define __M4RI_DEBUG_MZD		0
#define __M4RI_HAVE_LIBPNG              1

#define __M4RI_CC                       "gcc -std=gnu99"
#define __M4RI_CFLAGS                   " -mmmx -msse -msse2  -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security"
#define __M4RI_SIMD_CFLAGS              " -mmmx -msse -msse2"
#define __M4RI_OPENMP_CFLAGS            ""

// Helper macros.
#define __M4RI_USE_MM_MALLOC		(__M4RI_HAVE_MM_MALLOC && __M4RI_HAVE_SSE2)
#define __M4RI_USE_POSIX_MEMALIGN	(__M4RI_HAVE_POSIX_MEMALIGN && __M4RI_HAVE_SSE2)
#define __M4RI_DD_QUIET			(0 && !0)

#endif // M4RI_M4RI_CONFIG_H