#if (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L) && !defined(restrict)
# if defined(__GNUC__) && __GNUC__ >= 4
# define restrict __restrict__
#if (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L) && !defined(restrict)
# if defined(__GNUC__) && __GNUC__ >= 4
# define restrict __restrict__