{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };

  outputs =
    { self, nixpkgs }:
    let
      defaultSystems = [
        "aarch64-linux"
        "aarch64-darwin"
        "x86_64-darwin"
        "x86_64-linux"
      ];
      forAllDefaultSystems = f: nixpkgs.lib.genAttrs defaultSystems (system: f system);
    in
    {
      devShells = forAllDefaultSystems (
        system:
        let
          pkgs = import nixpkgs { inherit system; };
        in
        {
          #default = self.devShells."${system}".;

          tex = pkgs.mkShell {
            buildInputs = with pkgs; [
              texliveBasic
            ];
          };

          rust = pkgs.mkShell {
            buildInputs = with pkgs; [
              rustc
              cargo
              gcc
              rustfmt
              clippy
            ];
          };

        }
      );

      formatter = forAllDefaultSystems (system: nixpkgs.legacyPackages.${system}.nixfmt-tree);
    };
}