--- Libc/Libc-391.5.21/pthreads/pthread_impl.h
+++ Libc/Libc-583/pthreads/pthread_impl.h
@@ -37,6 +37,7 @@
 #define _PTHREAD_MUTEX_SIG_init		0x32AAABA7
 #define _PTHREAD_COND_SIG_init		0x3CB0B1BB
 #define _PTHREAD_ONCE_SIG_init		0x30B1BCBA
+#define _PTHREAD_RWLOCK_SIG_init    0x2DA8B3B4
 /*
  * POSIX scheduling policies
  */