--- Libc/Libc-763.13/pthreads/pthread_impl.h
+++ Libc/Libc-498/pthreads/pthread_impl.h
@@ -35,15 +35,9 @@
  * [Internal] data structure signatures
  */
 #define _PTHREAD_MUTEX_SIG_init		0x32AAABA7
-
-#define _PTHREAD_ERRORCHECK_MUTEX_SIG_init      0x32AAABA1
-#define _PTHREAD_RECURSIVE_MUTEX_SIG_init       0x32AAABA2
-#define _PTHREAD_FIRSTFIT_MUTEX_SIG_init       0x32AAABA3
-
 #define _PTHREAD_COND_SIG_init		0x3CB0B1BB
 #define _PTHREAD_ONCE_SIG_init		0x30B1BCBA
 #define _PTHREAD_RWLOCK_SIG_init    0x2DA8B3B4
-
 /*
  * POSIX scheduling policies
  */