int clearenv(void);
#define WCOREDUMP(s) ((s) & 0x80)
#define WIFCONTINUED(s) ((s) == 0xffff)
+void *reallocarray (void *, size_t, size_t);
#endif
#ifdef _GNU_SOURCE
char *ecvt(double, int, int *, int *);
char *fcvt(double, int, int *, int *);
char *gcvt(double, int, char *);
+char *secure_getenv(const char *);
struct __locale_struct;
float strtof_l(const char *__restrict, char **__restrict, struct __locale_struct *);
double strtod_l(const char *__restrict, char **__restrict, struct __locale_struct *);