callPackage: set configurationArm to trivial

flake.nix

@@ -38,6 +38,7 @@
         legacyPackages = pkgs.callPackage (nixpkgs + /pkgs/development/haskell-modules) {
           buildHaskellPackages = pkgs.haskell.packages.ghc942;
           compilerConfig = pkgs.callPackage ./configuration-ghc-9.4.x.nix { inherit haskellLib; };
+          configurationArm = { pkgs, haskellLib }: self: super: { };
           configurationCommon = import ./configuration.nix;
           configurationNix = { pkgs, haskellLib }: self: super: { };
           ghc = pkgs.haskell.compiler.ghc942;