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diff --git a/src/lib/Xmobar/Plugins/Mail.hs b/src/lib/Xmobar/Plugins/Mail.hs
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+++ b/src/lib/Xmobar/Plugins/Mail.hs
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+{-# LANGUAGE CPP #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Mail
+-- Copyright   :  (c) Spencer Janssen
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Spencer Janssen <sjanssen@cse.unl.edu>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A plugin for checking mail.
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Mail where
+
+import Xmobar.Plugins
+#ifdef INOTIFY
+import Xmobar.Plugins.Utils (expandHome, changeLoop)
+
+import Control.Monad
+import Control.Concurrent.STM
+
+import System.Directory
+import System.FilePath
+import System.INotify
+
+import Data.List (isPrefixOf)
+import Data.Set (Set)
+import qualified Data.Set as S
+
+#if MIN_VERSION_hinotify(0,3,10)
+import qualified Data.ByteString.Char8 as BS (ByteString, pack, unpack)
+unpack :: BS.ByteString -> String
+unpack = BS.unpack
+pack :: String -> BS.ByteString
+pack = BS.pack
+#else
+unpack :: String -> String
+unpack = id
+pack :: String -> String
+pack = id
+#endif
+#else
+import System.IO
+#endif
+
+
+-- | A list of mail box names and paths to maildirs.
+data Mail = Mail [(String, FilePath)] String
+    deriving (Read, Show)
+
+instance Exec Mail where
+    alias (Mail _ a) = a
+#ifndef INOTIFY
+    start _ _ =
+        hPutStrLn stderr $ "Warning: xmobar is not compiled with -fwith_inotify,"
+                        ++ " but the Mail plugin requires it."
+#else
+    start (Mail ms _) cb = do
+        vs <- mapM (const $ newTVarIO S.empty) ms
+
+        let ts = map fst ms
+            rs = map ((</> "new") . snd) ms
+            ev = [Move, MoveIn, MoveOut, Create, Delete]
+
+        ds <- mapM expandHome rs
+        i <- initINotify
+        zipWithM_ (\d v -> addWatch i ev d (handle v)) (map pack ds) vs
+
+        forM_ (zip ds vs) $ \(d, v) -> do
+            s <- fmap (S.fromList . filter (not . isPrefixOf "."))
+                    $ getDirectoryContents d
+            atomically $ modifyTVar v (S.union s)
+
+        changeLoop (mapM (fmap S.size . readTVar) vs) $ \ns ->
+            cb . unwords $ [m ++ show n
+                            | (m, n) <- zip ts ns
+                            , n /= 0 ]
+
+handle :: TVar (Set String) -> Event -> IO ()
+handle v e = atomically $ modifyTVar v $ case e of
+    Created  {} -> create
+    MovedIn  {} -> create
+    Deleted  {} -> delete
+    MovedOut {} -> delete
+    _           -> id
+ where
+    delete = S.delete ((unpack . filePath) e)
+    create = S.insert ((unpack . filePath) e)
+#endif