--- gcc/tree.h
+++ gcc/tree.h
@@ -5444,7 +5444,8 @@ extern tree fold_builtin_memory_chk (location_t, tree, tree, tree, tree, tree, t
 				     enum built_in_function);
 extern tree fold_builtin_stxcpy_chk (location_t, tree, tree, tree, tree, tree, bool,
 				     enum built_in_function);
-extern tree fold_builtin_strncpy_chk (location_t, tree, tree, tree, tree, tree);
+extern tree fold_builtin_stxncpy_chk (location_t, tree, tree, tree, tree, tree, bool,
+				     enum built_in_function);

"enum " should be aligned below "location_t,".