fix imports for non-GHC

diff --git a/Foreign/Ptr.hs b/Foreign/Ptr.hs
index 23706a8..90d395f 100644 (file)
--- a/Foreign/Ptr.hs
+++ b/Foreign/Ptr.hs
@@ -62,6 +62,7 @@ import GHC.Word               ( Word(..) )
 import Data.Int
 import Data.Word
 #else
+import Control.Monad   ( liftM )
 import Foreign.C.Types
 #endif