diff -Nru ruby-1.8.4.orig/configure ruby-1.8.4/configure
--- ruby-1.8.4.orig/configure	2005-12-25 11:19:52.000000000 +0100
+++ ruby-1.8.4/configure	2005-12-25 11:20:06.000000000 +0100
@@ -15398,7 +15398,7 @@
 _ACEOF
 
 else
-    arch="${target_cpu}-${target_os}"
+    arch="${target_os}"
     cat >>confdefs.h <<_ACEOF
 #define RUBY_PLATFORM "${arch}"
 _ACEOF