diff --git a/libc/include/android/legacy_errno_inlines.h b/libc/include/android/legacy_errno_inlines.h
deleted file mode 100644
index fcbca13..0000000
--- a/libc/include/android/legacy_errno_inlines.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#pragma once
-
-#include <sys/cdefs.h>
-
-#if __ANDROID_API__ < 21
-
-#include <errno.h>
-
-__BEGIN_DECLS
-
-static __inline int __attribute__((deprecated)) __set_errno(int n) {
-  errno = n;
-  return -1;
-}
-
-__END_DECLS
-
-#endif
diff --git a/libc/include/bits/threads_inlines.h b/libc/include/bits/threads_inlines.h
index afaed64..17de4a1 100644
--- a/libc/include/bits/threads_inlines.h
+++ b/libc/include/bits/threads_inlines.h
@@ -103,12 +103,10 @@
   return __bionic_thrd_error(pthread_mutex_lock(__mtx));
 }
 
-#if __ANDROID_API__ >= 21
 __BIONIC_THREADS_INLINE int mtx_timedlock(mtx_t* __mtx,
                                           const struct timespec* __timeout) {
   return __bionic_thrd_error(pthread_mutex_timedlock(__mtx, __timeout));
 }
-#endif
 
 __BIONIC_THREADS_INLINE int mtx_trylock(mtx_t* __mtx) {
   return __bionic_thrd_error(pthread_mutex_trylock(__mtx));
diff --git a/libc/include/errno.h b/libc/include/errno.h
index b6a4c7e..ab56bb3 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -58,5 +58,3 @@
 #define errno (*__errno())
 
 __END_DECLS
-
-#include <android/legacy_errno_inlines.h>