diff --git a/libc/bionic/pthread_internal.h b/libc/bionic/pthread_internal.h
index ce8b410..8cca83a 100644
--- a/libc/bionic/pthread_internal.h
+++ b/libc/bionic/pthread_internal.h
@@ -29,13 +29,8 @@
 #define _PTHREAD_INTERNAL_H_
 
 #include <pthread.h>
-#include <stdbool.h>
-#include <sys/cdefs.h>
 
-__BEGIN_DECLS
-
-typedef struct pthread_internal_t
-{
+struct pthread_internal_t {
     struct pthread_internal_t*  next;
     struct pthread_internal_t*  prev;
     pthread_attr_t              attr;
@@ -55,12 +50,12 @@
      */
 #define __BIONIC_DLERROR_BUFFER_SIZE 512
     char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
-} pthread_internal_t;
+};
 
-int _init_thread(pthread_internal_t* thread, bool add_to_thread_list);
-void __init_tls(pthread_internal_t* thread);
-void _pthread_internal_add(pthread_internal_t* thread);
-pthread_internal_t* __get_thread(void);
+__LIBC_HIDDEN__ int _init_thread(pthread_internal_t* thread, bool add_to_thread_list);
+__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
+__LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
+__LIBC_HIDDEN__ pthread_internal_t* __get_thread(void);
 
 __LIBC_HIDDEN__ void pthread_key_clean_all(void);
 __LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread);
@@ -91,12 +86,13 @@
 __LIBC_HIDDEN__ extern pthread_internal_t* gThreadList;
 __LIBC_HIDDEN__ extern pthread_mutex_t gThreadListLock;
 
-/* needed by fork.c */
-extern void __timer_table_start_stop(int  stop);
-extern void __bionic_atfork_run_prepare();
-extern void __bionic_atfork_run_child();
-extern void __bionic_atfork_run_parent();
+__LIBC_HIDDEN__ int __timespec_to_absolute(timespec*, const timespec*, clockid_t);
 
-__END_DECLS
+/* needed by fork.c */
+__LIBC_HIDDEN__ extern void __timer_table_start_stop(int);
+__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare();
+__LIBC_HIDDEN__ extern void __bionic_atfork_run_child();
+__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent();
+__LIBC_HIDDEN__ extern int __pthread_settid(pthread_t, pid_t);
 
 #endif /* _PTHREAD_INTERNAL_H_ */