{ pkgs, ... }: { nixpkgs.overlays = [ (self: super: { haskellPackages = super.haskellPackages.override { overrides = haskellPackages-self: haskellPackages-super: { basement = haskellPackages-super.basement.overrideAttrs (oldAttrs: { patches = [ ./IntWord64.patch ]; }); }; }; }) ]; }