nix-shell -p zlib to shell.nix

shell.nix

{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  f = { mkDerivation, base, directory, stdenv, text, turtle, zlib }:
      mkDerivation {
        pname = "haskell-editor-setup";
        version = "0.1.0.0";
        src = ./.;
        isLibrary = false;
        isExecutable = true;
        buildInputs = [ zlib ];
        executableHaskellDepends = [ base directory text turtle ];
        description = "Terminal program that will set up Haskell environment with a target selected editor or IDE";
        license = stdenv.lib.licenses.gpl3;
      };

  haskellPackages = if compiler == "default"
                       then pkgs.haskellPackages
                       else pkgs.haskell.packages.${compiler};

  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;

  drv = variant (haskellPackages.callPackage f {});

in

  if pkgs.lib.inNixShell then drv.env else drv