--- a/config/config.sub
+++ b/config/config.sub
@@ -380,6 +380,9 @@ case $basic_machine in
amd64)
basic_machine=x86_64-pc
;;
+ amd64-*)
+ basic_machine=x86_64-`echo $basic_machine | sed 's/^[^-]*-//'`
+ ;;
amdahl)
basic_machine=580-amdahl
os=-sysv