This version of stack uses some language features that changed from 8.6 to
8.8.

diff --git a/src/Stack/Storage/User.hs.old b/src/Stack/Storage/User.hs
index 3845b09..cfc17d5 100644
--- a/src/Stack/Storage/User.hs
+++ b/src/Stack/Storage/User.hs
@@ -10,6 +10,8 @@
 {-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE UndecidableInstances #-}
+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE StandaloneDeriving #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds -Wno-identities #-}

 -- | Work with SQLite database used for caches across an entire user account.
--- a/src/Stack/Storage/Project.hs.old
+++ b/src/Stack/Storage/Project.hs
@@ -10,4 +10,6 @@
 {-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE UndecidableInstances #-}
+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE StandaloneDeriving #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds -Wno-identities #-}

 -- | Work with SQLite database used for caches across a single project.