7.4 ships with (<>) = mappend

yesod/scaffold/Import.hs.cg

@@ -2,11 +2,13 @@ module Import
     ( module Prelude
     , module Yesod
     , module Foundation
-    , (<>)
-    , Text
     , module Data.Monoid
     , module Control.Applicative
     , module Settings.StaticFiles
+    , Text
+#if __GLASGOW_HASKELL__ <= 740
+    , (<>)
+#endif
     ) where
 
 import Prelude hiding (writeFile, readFile, head, tail, init, last)
@@ -17,6 +19,8 @@ import Control.Applicative ((<$>), (<*>), pure)
 import Data.Text (Text)
 import Settings.StaticFiles
 
+#if __GLASGOW_HASKELL__ <= 740
 infixr 5 <>
 (<>) :: Monoid m => m -> m -> m
 (<>) = mappend
+#endif