Work-around for overaging POSIX systems

src/misc/mtime.c

@@ -67,7 +67,11 @@ struct timespec
 int nanosleep(struct timespec *, struct timespec *);
 #endif
 
-#if (!defined (_POSIX_CLOCK_SELECTION)) || (_POSIX_CLOCK_SELECTION < 0)
+#if !defined (_POSIX_CLOCK_SELECTION)
+#  define _POSIX_CLOCK_SELECTION (-1)
+#endif
+
+# if (_POSIX_CLOCK_SELECTION < 0)
 /*
  * We cannot use the monotonic clock is clock selection is not available,
  * as it would screw vlc_cond_timedwait() completely. Instead, we have to

src/misc/threads.c

@@ -484,7 +484,11 @@ int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
     if (ret)
         return ret;
 
-# if defined (_POSIX_CLOCK_SELECTION) && (_POSIX_CLOCK_SELECTION >= 0)
+# if !defined (_POSIX_CLOCK_SELECTION)
+   /* Fairly outdated POSIX support (that was defined in 2001) */
+#  define _POSIX_CLOCK_SELECTION (-1)
+# endif
+# if (_POSIX_CLOCK_SELECTION >= 0)
     /* NOTE: This must be the same clock as the one in mtime.c */
     pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
 # endif