Merge branch 'master' into v8

Database/Keys/SQL.hs

@@ -5,11 +5,16 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE QuasiQuotes, TypeFamilies, TemplateHaskell #-}
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes, ScopedTypeVariables #-}
 {-# LANGUAGE UndecidableInstances #-}
+#if MIN_VERSION_persistent_template(2,8,0)
+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE StandaloneDeriving #-}
+#endif
 
 module Database.Keys.SQL where