extern "C" {
#endif
-#undef NULL
+#include <features.h>
+
#ifdef __cplusplus
-#define NULL 0
+#define NULL 0L
#else
#define NULL ((void*)0)
#endif
struct lconv *localeconv(void);
-#if 1
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define __NEED_locale_t