#include <stdio.h>
#include <gmp.h>
#include <mpfr.h>

int main(void) {
#if MPFR_VERSION >= MPFR_VERSION_NUM(4,1,0)
 if(mpfr_buildopt_decimal_p())
   printf("128");
 else printf("mpfr_buildopt_decimal_p() returned false");
#else
 printf("This version (%s) of mpfr does not support _Decimal128. Need at least 4.1.0", MPFR_VERSION_STRING);
#endif
 return 0;
}