diff --git a/ChangeLog b/ChangeLog
index c47018c34..0cc61937c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-12-08  Jan-Benedict Glaw  <jbglaw@lug-owl.de>
+
+	* config.sub: Merge from config repo.
+
 2012-11-30  Jan-Benedict Glaw  <jbglaw@lug-owl.de>
 
 	* configure.ac: Merge from GCC.
diff --git a/config.sub b/config.sub
index 89b128630..8df551109 100755
--- a/config.sub
+++ b/config.sub
@@ -4,7 +4,7 @@
 #   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #   2011, 2012 Free Software Foundation, Inc.
 
-timestamp='2012-10-10'
+timestamp='2012-12-06'
 
 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -1026,7 +1026,11 @@ case $basic_machine in
 		basic_machine=i586-unknown
 		os=-pw32
 		;;
-	rdos)
+	rdos | rdos64)
+		basic_machine=x86_64-pc
+		os=-rdos
+		;;
+	rdos32)
 		basic_machine=i386-pc
 		os=-rdos
 		;;