{
  description = "confwhich: easily obtain info about XDG_CONFIG useage";

  inputs.nixpkgs.url = "nixpkgs/nixpkgs-unstable";

  outputs =
    { nixpkgs, ... }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];

      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
    in
    {
      devShells = forAllSystems (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          overrides = (builtins.fromTOML (builtins.readFile ./rust-toolchain.toml));
          libPath =
            with pkgs;
            lib.makeLibraryPath [
            ];
        in
        {
          default = pkgs.mkShell {
            buildInputs = with pkgs; [
              llvmPackages.bintools
              rustup
            ];
            RUSTC_VERSION = overrides.toolchain.channel;
            # https://github.com/rust-lang/rust-bindgen#environment-variables
            LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.llvmPackages_latest.libclang.lib ];
            shellHook = ''
              export PATH=$PATH:''${CARGO_HOME:-~/.cargo}/bin
              export PATH=$PATH:''${RUSTUP_HOME:-~/.rustup}/toolchains/$RUSTC_VERSION-x86_64-unknown-linux-gnu/bin/
            '';

            # Add precompiled library to rustc search path
            RUSTFLAGS = (
              builtins.map (a: ''-L ${a}/lib'') [
                # add libraries here (e.g. pkgs.libvmi)
              ]
            );
            LD_LIBRARY_PATH = libPath;
            # Add glibc, clang, glib, and other headers to bindgen search path
            BINDGEN_EXTRA_CLANG_ARGS =
              # Includes normal include path
              (builtins.map (a: ''-I"${a}/include"'') [
                # add dev libraries here (e.g. pkgs.libvmi.dev)
                pkgs.glibc.dev
              ])
              # Includes with special directory paths
              ++ [
                ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
                ''-I"${pkgs.glib.dev}/include/glib-2.0"''
                ''-I${pkgs.glib.out}/lib/glib-2.0/include/''
              ];
            packages = with pkgs; [
              # base toolchain
              pkg-config
              rustup
              nil
            ];
          };
        }
      );

      packages = forAllSystems (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          rfindup-pkg = (pkgs.callPackage ./nix/package.nix { });
        in
        {
          rfindup = rfindup-pkg;
          default = rfindup-pkg;
        }
      );
    };
}