{ pkgs ? import <nixpkgs> {} }:
let
  unstable = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz") { };
in
pkgs.mkShell {
  buildInputs = with pkgs; [
    unstable.silice

    icestorm
    yosys
    nextpnr

    dfu-util
  ];
}