{ pkgs, inputs, ... }: {

  environment.systemPackages = with pkgs;
  let
    kicad = pkgs.kicad.override {
      addons = with pkgs.kicadAddons; [ kikit kikit-library ];
    };
  in
  [
    # general
    cmake
    gcc
    gef
    gdb
    binutils
    binwalk
    clang
    clang-tools
    direnv
    sops
    nil
    nixpkgs-fmt
    nix-index
    kicad
    freecad-wayland
    imhex
  ];

  # Wireshark
  programs.wireshark = {
    enable = true;
    package = pkgs.wireshark;
  };
  users.users."0xa".extraGroups = [ "wireshark" ];

  ## Julia
  environment.variables = {
    JULIA_NUM_THREADS = "8";
  };

  ## direnv
  programs.bash.interactiveShellInit = ''
    eval "$(direnv hook bash)"
  '';
  programs.zsh.interactiveShellInit = ''
    eval "$(direnv hook zsh)"
  '';
  # nix options for derivations to persist garbage collection
  nix.extraOptions = ''
    keep-outputs = true
    keep-derivations = true
  '';
  environment.pathsToLink = [
    "/share/nix-direnv"
  ];
}