diff --git a/libstdc++/stl/ChangeLog b/libstdc++/stl/ChangeLog
index d95b1073c08e..848f74b61ec1 100644
--- a/libstdc++/stl/ChangeLog
+++ b/libstdc++/stl/ChangeLog
@@ -1,5 +1,6 @@
 1998-10-11  Mark Mitchell  <mark@markmitchell.com>
 
+	* stl_config.h (__SGI_STL_USE_AUTO_PTR_CONVERSIONS): Define.
 	* memory (auto_ptr::operator auto_ptr_ref<_Tp1>): Fix typo.
 	(auto_ptr::operator auto_ptr<_Tp1>): Add missing 
 	semicolon.
diff --git a/libstdc++/stl/stl_config.h b/libstdc++/stl/stl_config.h
index 7cd60d8460d9..31efbf8731f1 100644
--- a/libstdc++/stl/stl_config.h
+++ b/libstdc++/stl/stl_config.h
@@ -159,6 +159,7 @@
 #     define __STL_EXPLICIT_FUNCTION_TMPL_ARGS
 #     define __STL_HAS_NAMESPACES
 #     define __STL_NO_NAMESPACES
+#     define __SGI_STL_USE_AUTO_PTR_CONVERSIONS
 #   endif
     /* glibc pre 2.0 is very buggy. We have to disable thread for it.
        It should be upgraded to glibc 2.0 or later. */