#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
#if GCC_VERSION < 2007
# define __attribute__(x)
#endif
#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#define LENGTH(x) (sizeof (x) / sizeof (*(x)))

#define bool int
#define true 1
#define false 0