# Pastebin J2OTTTLP
{ nixpkgs ? import <nixpkgs> {} }:

let
  haskellPackages = nixpkgs.haskellPackages.override {
    overrides = self: super: {
      these = super.callCabal2nix "these" ./these {};
      semialign = super.callCabal2nix "semialign" ./semialign {};
      semialign-indexed = super.callCabal2nix "semialign-indexed" ./semialign-indexed {};
    };
  };
in
  haskellPackages.ghcWithPackages (p: [p.semialign p.semialign-indexed p.these])