diff --git a/fswatch.cabal b/fswatch.cabal
--- a/fswatch.cabal
+++ b/fswatch.cabal
@@ -1,6 +1,6 @@
 
 name:                fswatch
-version:             0.1.0.2
+version:             0.1.0.3
 synopsis:            File System watching tool with cli and slave functionalities.
 description:         File System watching tool with cli and slave lib (with os process) functionalities.
 category:            Filesystem
@@ -17,25 +17,28 @@
   exposed-modules:     System.FSWatch
                      , System.FSWatch.Repr
                      , System.FSWatch.Slave
-  build-depends:       base >=4.10 && <4.11
+  build-depends:       base >=4.9 && <4.12
                      , haskeline >=0.7 && <0.8
                      , directory >=1.3.0
                      , fsnotify >=0.2.1
                      , optparse-applicative >= 0.13.2
-                     , process >=1.6
+                     , process >=1.4
   hs-source-dirs:      src
   default-language:    Haskell2010
 
 executable hfswatch
   ghc-options:         -threaded
   main-is:             Main.hs
+  other-modules:       System.FSWatch
+                     , System.FSWatch.Repr
+                     , System.FSWatch.Slave
   other-extensions:    ViewPatterns, RecordWildCards
-  build-depends:       base >=4.10 && <4.11
+  build-depends:       base >=4.9 && <4.12
                      , haskeline >=0.7 && <0.8
                      , directory >=1.3.0
                      , fsnotify >=0.2.1
                      , optparse-applicative >= 0.13.2
-                     , process >=1.4.3
+                     , process >=1.4
                      , fswatch
   hs-source-dirs:      src
   default-language:    Haskell2010
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -6,4 +6,3 @@
 
 main :: IO ()
 main = watchMain
-
diff --git a/src/System/FSWatch.hs b/src/System/FSWatch.hs
--- a/src/System/FSWatch.hs
+++ b/src/System/FSWatch.hs
@@ -8,14 +8,14 @@
 import Data.List
 import Data.Semigroup ((<>))
 
-import Control.Monad
-import Control.Monad.IO.Class
 import Control.Concurrent
+import Control.Monad
+import Control.Monad.IO.Class (MonadIO(..))
 import Options.Applicative hiding (defaultPrefs)
 
 import System.Console.Haskeline
-import System.Console.Haskeline.History
-import System.Directory
+import System.Console.Haskeline.History (historyLines)
+import System.Directory (canonicalizePath)
 import System.FSNotify
 import System.IO
 
@@ -168,7 +168,7 @@
 event2PE (Removed str _) = Rem str
 
 stop :: P -> String -> DB -> InputT IO ()
-stop p fn [] = printP p "no whatching this"
+stop p _ [] = printP p "no whatching this"
 stop p fn (DBE{..}:dbo) = if wfn /= fn then stop p fn dbo else liftIO (stopManager wman)
 
 startPrinter :: State -> MVar PrintFormat -> Chan PE -> IO (IO ())
@@ -177,8 +177,6 @@
     noBufferClock <- newEmptyMVar
     fixBufferClock <- newEmptyMVar
     delayedBufferClock <- newEmptyMVar
-    bf <- readMVar buffering
-    lastBufferMode <- newMVar bf
 
     t1 <- forkIO $ void $ forever $ do
         e <- readChan ch
diff --git a/src/System/FSWatch/Repr.hs b/src/System/FSWatch/Repr.hs
--- a/src/System/FSWatch/Repr.hs
+++ b/src/System/FSWatch/Repr.hs
@@ -1,12 +1,11 @@
 module System.FSWatch.Repr where
 
 
-import Control.Concurrent
-
-import System.FSNotify
-import System.IO
-import System.Process
+import Control.Concurrent (MVar, Chan)
 
+import System.FSNotify (WatchManager)
+import System.IO (IO, Handle)
+import System.Process (ProcessHandle)
 
 data WatchProcess = WatchProcess
   { wPath :: String
diff --git a/src/System/FSWatch/Slave.hs b/src/System/FSWatch/Slave.hs
--- a/src/System/FSWatch/Slave.hs
+++ b/src/System/FSWatch/Slave.hs
@@ -13,14 +13,14 @@
                             , waitNotifies
                             ) where
 
-import Control.Monad
-import Control.Monad.IO.Class
 import Control.Concurrent
+import Control.Monad
+import Control.Monad.IO.Class (MonadIO(..))
 
 import System.IO
 import System.Process
 
-import System.FSWatch.Repr
+import System.FSWatch.Repr (PE, Listener, WatchProcess(..))
 
 
 createWatchProcess :: (MonadIO m) => String -> Int -> m WatchProcess