{
  inputs = {
    nixpkgs.url = "nixpkgs/nixpkgs-unstable";
    hs-bindgen.url = "github:well-typed/hs-bindgen";
  };
  outputs = {
    nixpkgs,
    hs-bindgen,
    self,
    ...
  }: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
  in {
    devShells.${system} = {
      default = pkgs.mkShell {
        stdenv = pkgs.clangStdenv;
        packages = [
          pkgs.pkg-config
          pkgs.xorg.libX11
          pkgs.xorg.libXcursor
          pkgs.xorg.libXrandr
          pkgs.xorg.libXi
          pkgs.libGL
          pkgs.clang
          hs-bindgen.packages.${system}.default
        ];
        shellHook = ''
          # template
          # export BINDGEN_EXTRA_CLANG_ARGS="$BINDGEN_EXTRA_CLANG_ARGS "

          # c flags from Nix
          export BINDGEN_EXTRA_CLANG_ARGS="$BINDGEN_EXTRA_CLANG_ARGS $(cat ${pkgs.clang}/nix-support/cc-cflags) $(cat ${pkgs.clang}/nix-support/libc-cflags) $NIX_CFLAGS_COMPILE"

          # pkg-config for libraries
          export BINDGEN_EXTRA_CLANG_ARGS="$BINDGEN_EXTRA_CLANG_ARGS $(pkg-config --cflags --libs x11 xrandr xcursor xi gl)"

          # add local headers
          export BINDGEN_EXTRA_CLANG_ARGS="$BINDGEN_EXTRA_CLANG_ARGS -isystem $PWD/lib"

          # no global include
          # export BINDGEN_BUILTIN_INCLUDE_DIR=disable

          echo $BINDGEN_EXTRA_CLANG_ARGS
        '';
      };
    };
  };
}