{ config, lib, pkgs, ... }:
{
  programs.zsh.enable = true;
  programs.tmux.enable = true;

  nixpkgs.config.packageOverrides = pkgs: {
    libsignal-protocol-c = pkgs.callPackage ../pkgs/libsignal-c/default.nix { };
    keycloak = pkgs.callPackage ../pkgs/keycloak/default.nix { };
  };

  environment.shellAliases = {
    vim = "nvim";
  };
  environment.systemPackages = with pkgs; [
    dnsutils
    git
    gnupg
    haskellPackages.hledger
    htop
    mosh
    neovim
    # nox  # Broken as of 2017-06-12
    pass
    silver-searcher
    whois
    unzip
    p7zip
    unrar
  ];
  time.timeZone = "America/New_York";

  services = {
    postgresql = {
      dataDir = "/var/db/postgresql";
      package = pkgs.postgresql95;
    };
    openssh.passwordAuthentication = false;
  };

  nix = rec {
    useSandbox = lib.mkDefault true;
    maxJobs = lib.mkOverride 110 16;
    buildCores = lib.mkDefault 0;  # auto configure
    gc.automatic = lib.mkDefault true;
    trustedBinaryCaches = [
      "https://cache.nixos.org"
    ];
    binaryCaches = trustedBinaryCaches;
    daemonNiceLevel = 10;
    daemonIONiceLevel = 10;
    package = pkgs.nixFlakes;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
  };

  boot.cleanTmpDir = true;

  nixpkgs.config.allowUnfree = true;
}