+#ifdef _GNU_SOURCE
+int clearenv(void);
+int ptsname_r(int, char *, size_t);
+char *ecvt(double, int, int *, int *);
+char *fcvt(double, int, int *, int *);
+char *gcvt(double, int, char *);
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define mkstemp64 mkstemp
+#endif