this stuff is for uClibc internal use only

libc/sysdeps/linux/common/bits/uClibc_pthread.h

@@ -27,10 +27,12 @@
 # error "Always include <pthread.h> rather than <bits/uClibc_pthread.h>"
 #endif
 
+#ifdef _LIBC
 extern int __pthread_mutex_init (pthread_mutex_t *__restrict __mutex,
 		__const pthread_mutexattr_t *__restrict __mutex_attr) attribute_hidden;
 extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex) attribute_hidden;
 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex) attribute_hidden;
 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex) attribute_hidden;
+#endif
 
 #endif