diff --git a/libc/include/dirent.h b/libc/include/dirent.h
index 2751b9e..4f5d0fb 100644
--- a/libc/include/dirent.h
+++ b/libc/include/dirent.h
@@ -123,10 +123,10 @@
  * or returns null and leaves `errno` unchanged at the end of the directory,
  * or returns null and sets `errno` on failure.
  */
-struct dirent64* _Nullable readdir64(DIR* _Nonnull __dir) __INTRODUCED_IN(21);
+struct dirent64* _Nullable readdir64(DIR* _Nonnull __dir);
 
 int readdir_r(DIR* _Nonnull __dir, struct dirent* _Nonnull __entry, struct dirent* _Nullable * _Nonnull __buffer) __attribute__((__deprecated__("readdir_r is deprecated; use readdir instead")));
-int readdir64_r(DIR* _Nonnull __dir, struct dirent64* _Nonnull __entry, struct dirent64* _Nullable * _Nonnull __buffer) __INTRODUCED_IN(21) __attribute__((__deprecated__("readdir64_r is deprecated; use readdir64 instead")));
+int readdir64_r(DIR* _Nonnull __dir, struct dirent64* _Nonnull __entry, struct dirent64* _Nullable * _Nonnull __buffer) __attribute__((__deprecated__("readdir64_r is deprecated; use readdir64 instead")));
 
 /**
  * [closedir(3)](http://man7.org/linux/man-pages/man3/closedir.3.html)
@@ -179,10 +179,8 @@
 /**
  * [alphasort64](http://man7.org/linux/man-pages/man3/alphasort.3.html) is a
  * comparator for use with scandir64() that uses strcmp().
- *
- * Available since API level 21.
  */
-int alphasort64(const struct dirent64* _Nonnull * _Nonnull __lhs, const struct dirent64* _Nonnull * _Nonnull __rhs) __INTRODUCED_IN(21);
+int alphasort64(const struct dirent64* _Nonnull * _Nonnull __lhs, const struct dirent64* _Nonnull * _Nonnull __rhs);
 
 /**
  * [scandir(3)](http://man7.org/linux/man-pages/man3/scandir.3.html)
@@ -205,10 +203,8 @@
  *
  * Returns the number of entries returned in the list on success,
  * and returns -1 and sets `errno` on failure.
- *
- * Available since API level 21.
  */
-int scandir64(const char* _Nonnull __path, struct dirent64* _Nonnull * _Nonnull * _Nonnull __name_list, int (* _Nullable __filter)(const struct dirent64* _Nonnull), int (* _Nullable __comparator)(const struct dirent64* _Nonnull * _Nonnull, const struct dirent64* _Nonnull * _Nonnull)) __INTRODUCED_IN(21);
+int scandir64(const char* _Nonnull __path, struct dirent64* _Nonnull * _Nonnull * _Nonnull __name_list, int (* _Nullable __filter)(const struct dirent64* _Nonnull), int (* _Nullable __comparator)(const struct dirent64* _Nonnull * _Nonnull, const struct dirent64* _Nonnull * _Nonnull));
 
 #if defined(__USE_GNU)