extern "C" {
#endif
+#include <features.h>
+
#include <bits/errno.h>
#ifdef __GNUC__
__attribute__((const))
#endif
-extern int *__errno_location(void);
+int *__errno_location(void);
#define errno (*__errno_location())
+#ifdef _GNU_SOURCE
+extern char *program_invocation_short_name, *program_invocation_name;
+#endif
+
#ifdef __cplusplus
}
#endif