diff --git a/include/locale.h b/include/locale.h
index 70230237..9da47269 100644
--- a/include/locale.h
+++ b/include/locale.h
@@ -53,7 +53,8 @@ char *setlocale (int, const char *);
 struct lconv *localeconv(void);
 
 
-#if 1
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
 
 #define __NEED_locale_t
 
diff --git a/include/time.h b/include/time.h
index e6cfb73d..a9e1d8fa 100644
--- a/include/time.h
+++ b/include/time.h
@@ -14,16 +14,19 @@ extern "C" {
 
 
 #define __NEED_time_t
-#define __NEED_struct_timespec
 #define __NEED_clock_t
+
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+#define __NEED_struct_timespec
 #define __NEED_clockid_t
 #define __NEED_timer_t
 #define __NEED_size_t
 #define __NEED_pid_t
+#endif
 
 #include <bits/alltypes.h>
 
-
 struct tm
 {
 	int tm_sec;
@@ -39,14 +42,35 @@ struct tm
 	const char *__tm_zone;
 };
 
+clock_t clock (void);
+time_t time (time_t *);
+double difftime (time_t, time_t);
+time_t mktime (struct tm *);
+size_t strftime (char *, size_t, const char *, const struct tm *);
+struct tm *gmtime (const time_t *);
+struct tm *localtime (const time_t *);
+char *asctime (const struct tm *);
+char *ctime (const time_t *);
+
+#define CLOCKS_PER_SEC 1000000UL
+
+
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+
+struct tm *gmtime_r (const time_t *, struct tm *);
+struct tm *localtime_r (const time_t *, struct tm *);
+char *asctime_r (const struct tm *, char *);
+char *ctime_r (const time_t *, char *);
+
+void tzset (void);
+
 struct itimerspec
 {
 	struct timespec it_interval;
 	struct timespec it_value;
 };
 
-#define CLOCKS_PER_SEC 1000000UL
-
 #define CLOCK_REALTIME           0
 #define CLOCK_MONOTONIC          1
 #define CLOCK_PROCESS_CPUTIME_ID 2
@@ -54,56 +78,33 @@ struct itimerspec
 
 #define TIMER_ABSTIME 1
 
-
-
-clock_t clock (void);
-time_t time (time_t *);
-double difftime (time_t, time_t);
-time_t mktime (struct tm *);
-size_t strftime (char *, size_t, const char *, const struct tm *);
-char *strptime (const char *, const char *, struct tm *);
-
-struct tm *gmtime (const time_t *);
-struct tm *gmtime_r (const time_t *, struct tm *);
-struct tm *localtime (const time_t *);
-struct tm *localtime_r (const time_t *, struct tm *);
-
-char *asctime (const struct tm *);
-char *asctime_r (const struct tm *, char *);
-char *ctime (const time_t *);
-char *ctime_r (const time_t *, char *);
-
-
-extern int daylight;
-extern long timezone;
-extern char *tzname[2];
-
-void tzset (void);
-
-
-
 int nanosleep (const struct timespec *, struct timespec *);
-
-
 int clock_getres (clockid_t, struct timespec *);
 int clock_gettime (clockid_t, struct timespec *);
 int clock_settime (clockid_t, const struct timespec *);
-
 int clock_nanosleep (clockid_t, int, const struct timespec *, struct timespec *);
 int clock_getcpuclockid (pid_t, clockid_t *);
 
-/* FIXME */
+/* FIXME..?? */
 struct sigevent;
 int timer_create (clockid_t, struct sigevent *, timer_t *);
 int timer_delete (timer_t);
-
 int timer_settime (timer_t, int, const struct itimerspec *, struct itimerspec *);
 int timer_gettime (timer_t, struct itimerspec *);
 int timer_getoverrun (timer_t);
 
+#endif
 
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+char *strptime (const char *, const char *, struct tm *);
+extern int daylight;
+extern long timezone;
+extern char *tzname[2];
 extern int getdate_err;
 extern struct tm *getdate (const char *);
+#endif
+
 
 #ifdef __cplusplus
 }