Enable compatibility with base < 4.11 (#310)

src/SDL/Input/Keyboard/Codes.hs

@@ -1,9 +1,12 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE PatternSynonyms #-}
 
+#if MIN_VERSION_base(4,11,0)
 {-# OPTIONS_GHC -fno-warn-missing-pattern-synonym-signatures #-}
+#endif
 {-# OPTIONS_GHC -fno-warn-missing-signatures #-}
 
 {-|

src/SDL/Input/Mouse.hs

@@ -43,7 +43,7 @@
 import Control.Monad (void)
 import Control.Monad.IO.Class (MonadIO, liftIO)
 import Data.Bits
 import Data.Bool
 import Data.Data (Data)
 import Data.List (nub)
 import Data.StateVar
@@ -68,6 +68,10 @@
 import Control.Applicative
 #endif
 
+#if !MIN_VERSION_base(4,11,0)
+import Data.Monoid ((<>))
+#endif
+
 data LocationMode
   = AbsoluteLocation
   | RelativeLocation
@@ -296,7 +300,7 @@
              => Point V2 CInt -- ^ The X- and Y-axis location of the upper left corner of the cursor relative to the actual mouse position
              -> [[Char]]
              -> m Cursor
 createCursorFrom point source = do
   createCursor color mask (V2 w h) point
   where
     h = fromIntegral (length source)

src/SDL/Raw/Enum.hsc

@@ -1,7 +1,10 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE PatternSynonyms #-}
 
+#if MIN_VERSION_base(4,11,0)
 {-# OPTIONS_GHC -fno-warn-missing-pattern-synonym-signatures #-}
+#endif
 {-# OPTIONS_GHC -fno-warn-missing-signatures #-}
 
 module SDL.Raw.Enum (