let
  pkgs = import <nixpkgs> { };
  compilerVersion = "ghc865"; 
  compiler = pkgs.haskell.packages."${compilerVersion}";
in
  compiler.developPackage {
    root = ./.;
    # source-overrides = {};
    modifier = drv:
      (pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
        [
          cabal-install
          cabal2nix
          nix-prefetch-git
          styx
        ])
			).overrideAttrs (old: {
        shellHook = ''
          export PS1='\n\[\033[1;32m\][\[\e]0;\u@\h: \W\a\]\u@\h:/\W]\$\[\033[0m\]'
        '';
			});
  }