ngx_sort
diff --git a/src/core/ngx_string.h b/src/core/ngx_string.h
index 00d0ae9..18306d2 100644
--- a/src/core/ngx_string.h
+++ b/src/core/ngx_string.h
@@ -150,6 +150,8 @@
 void ngx_unescape_uri(u_char **dst, u_char **src, size_t size, ngx_uint_t type);
 
 
+void ngx_sort(void *base, size_t n, size_t size,
+    int (*cmp)(const void *, const void *));
 #define ngx_qsort            qsort