FIX BUILD with GHC 6.4.x

compiler/utils/Fingerprint.hsc

@@ -35,7 +35,10 @@ fingerprint0 :: Fingerprint
 fingerprint0 = Fingerprint 0 0
 
 instance Outputable Fingerprint where
-  ppr (Fingerprint w1 w2) = text (printf "%016x%016x" w1 w2)
+  ppr (Fingerprint w1 w2) = text (printf "%016x%016x" i1 i2)
+    where i1 = fromIntegral w1 :: Integer
+          i2 = fromIntegral w2 :: Integer
+          -- printf in GHC 6.4.2 didn't have Word64 instances
 
 -- useful for parsing the output of 'md5sum', should we want to do that.
 readHexFingerprint :: String -> Fingerprint