1 files changed, 18 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix b/nixpkgs/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
index 69eea055315a..5b17975ca8b7 100644
--- a/nixpkgs/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
+++ b/nixpkgs/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
@@ -4,6 +4,7 @@ with haskellLib;
 
 let
   inherit (pkgs.stdenv.hostPlatform) isDarwin;
+  inherit (pkgs) lib;
 in
 
 self: super: {
@@ -135,4 +136,21 @@ self: super: {
 
   # No instance for (Show B.Builder) arising from a use of ‘print’
   http-types = dontCheck super.http-types;
+
+  # Packages which need compat library for GHC < 9.6
+  inherit
+    (lib.mapAttrs
+      (_: addBuildDepends [ self.foldable1-classes-compat ])
+      super)
+    indexed-traversable
+    these
+  ;
+  base-compat-batteries = addBuildDepends [
+    self.foldable1-classes-compat
+    self.OneTuple
+  ] super.base-compat-batteries;
+  OneTuple = addBuildDepends [
+    self.foldable1-classes-compat
+    self.base-orphans
+  ] super.OneTuple;
 }