{ nixpkgs ? import (fetchGit { name = "nixos-release-19.09"; url = "https://github.com/NixOS/nixpkgs"; # obtained via # git ls-remote https://github.com/nixos/nixpkgs master ref = "refs/heads/nixpkgs-19.09-darwin"; rev = "d5291756487d70bc336e33512a9baf9fa1788faf"; }) { config = { allowBroken = true; }; } }: let inherit (nixpkgs) pkgs; inherit (pkgs) haskellPackages; haskellDeps = ps: with ps; [ base protolude containers ]; hspkgs = haskellPackages; ghc = hspkgs.ghcWithPackages haskellDeps; nixPackages = [ ghc pkgs.gdb hspkgs.summoner hspkgs.summoner-tui haskellPackages.cabal-install haskellPackages.ghcid ]; in pkgs.stdenv.mkDerivation { name = "env"; buildInputs = nixPackages; shellHook = '' export PS1="\n\[[hs:\033[1;32m\]\W\[\033[0m\]]> " ''; }