Only in bytestring-0.9.2.0.jhc: bytestring.yaml
diff -ru bytestring-0.9.2.0/Data/ByteString.hs bytestring-0.9.2.0.jhc/Data/ByteString.hs
--- bytestring-0.9.2.0/Data/ByteString.hs	2011-08-25 05:19:31.000000000 -0700
+++ bytestring-0.9.2.0.jhc/Data/ByteString.hs	2012-02-06 04:48:48.116356373 -0800
@@ -243,7 +243,7 @@
 -- hGetBuf and hPutBuf not available in yhc or nhc
 import System.IO                (stdin,stdout,hClose,hFileSize
                                 ,hGetBuf,hPutBuf,openBinaryFile
-                                ,IOMode(..))
+                                ,IOMode(..),Handle,hWaitForInput)
 import System.IO.Error          (mkIOError, illegalOperationErrorType)
 
 import Data.Monoid              (Monoid, mempty, mappend, mconcat)
@@ -1910,7 +1910,7 @@
   bytesWritten <- withForeignPtr ps $ \p-> hPutBufNonBlocking h (p `plusPtr` s) l
   return $! drop bytesWritten bs
 #else
-hPutNonBlocking :: Handle -> B.ByteString -> IO Int
+hPutNonBlocking :: Handle -> ByteString -> IO ByteString
 hPutNonBlocking h bs = hPut h bs >> return empty
 #endif