Index: ghc-7.0.4/ghc/Main.hs
===================================================================
--- ghc-7.0.4.orig/ghc/Main.hs	2011-07-16 11:20:11.000000000 +0200
+++ ghc-7.0.4/ghc/Main.hs	2011-07-16 11:21:16.000000000 +0200
@@ -753,6 +753,7 @@
   ifaces <- initIfaceCheck hsc_env $ mapM get_iface mods
 
   bh <- openBinMem (3*1024) -- just less than a block
+  put_ bh opt_HiVersion
   mapM_ (put_ bh . mi_mod_hash) ifaces
   f <- fingerprintBinMem bh
 
