{ pkgs ? import (builtins.fetchTarball {
  name = "nixpkgs-unstable";
  url = https://github.com/NixOS/nixpkgs/archive/8f80568885d1b37cccbede85143c00711b19390c.tar.gz;
  sha256 = "080cbcj4b08aa02qybf10pbf54cdvaxvgddx1w5gzrga1nacyilh";
}) {}
}:

let
  klee = pkgs.callPackage ./klee.nix {};
in
pkgs.stdenv.mkDerivation {
  name = "ap-cs-klee";
  buildInputs = with pkgs; [ klee clang_9 gnumake ];
}