let nixpkgs = import (builtins.fetchTarball {
    url = "https://github.com/nixos/nixpkgs/archive/df29219f5118dd1ae1d02108aeea4484e20d67e8.tar.gz";
    sha256 = "0lp6j6as8pbj6q7cpr0nbbh0nrxyf184x001jg5d5mwis03zky70";
  }) ;
in
nixpkgs {
  config = {
    allowUnfree = true;
    packageOverrides = pkgs: {
      haskellPackages = pkgs.haskellPackages.override {
        overrides = self: super: {
          text-s3 = self.callPackage text-s3/. {};
          shakeTestbett = self.callPackage shakeTestbett/. {zlib = pkgs.zlib.static; glibc = pkgs.glibc.static; static = true; };
          shakeTestbettWithDevTools = pkgs.haskell.lib.addBuildDepends self.shakeTestbett [self.cabal-install self.hlint self.ghcid];
        };
      };
    };
  };
}