with (import (builtins.fetchGit {
  name = "nixos-21.05-2021-08-02";
  url = "https://github.com/nixos/nixpkgs/";
  ref = "refs/heads/nixos-21.05";
  rev = "d4590d21006387dcb190c516724cb1e41c0f8fdf";
}){});

mkShell {

  buildInputs = with haskellPackages; [
    cabal-install
    stylish-haskell
    tmux
    (ghc.withPackages (hp: [ hp.zlib ]))
  ];

}