{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

    crane = {
      url = "github:ipetkov/crane";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    flake-utils.url = "github:numtide/flake-utils";

    devenv = {
      url = "github:cachix/devenv/1e4701fb1f51f8e6fe3b0318fc2b80aed0761914";
    };
  };

  outputs = {
    self,
    nixpkgs,
    crane,
    fenix,
    flake-utils,
    devenv,
    ...
  } @ inputs:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages.${system};
      rs-toolchain = with fenix.packages.${system};
        combine [
          complete.toolchain
        ];
    in {
      # devShells.default = pkgs.mkShell rec {
      #   buildInputs = with pkgs; [
      #   ];

      #   LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
      # };

      devShells.default = devenv.lib.mkShell {
        inherit inputs pkgs;
        modules = [
          ({pkgs, ...}: {
            packages = with pkgs; [
              rs-toolchain
              sqlx-cli
              libpqxx
              cargo-watch
              bacon
            ];
            languages.rust.enable = true;

            services.postgres = {
              enable = true;
              listen_addresses = "127.0.0.1";
            };

            env = rec {
              DATABASE_URL = "postgres://localhost/chatdings";
              CHATDINGS_DB_URL = DATABASE_URL;
              CHATDINGS_ADMIN_TOKEN_PATH = "./test_admin_tok.txt";
            };
          })
        ];
      };
      packages.default = let
        toolchain = inputs.fenix.packages.${system}.minimal.toolchain;
        pkgs = nixpkgs.legacyPackages.${system};
      in
        (pkgs.makeRustPlatform {
          cargo = toolchain;
          rustc = toolchain;
        })
        .buildRustPackage {
          pname = "chatthing";
          version = "0.1.0";
          src = ./.;
          builtInputs = [pkgs.libpqxx pkgs.openssl];
          nativeBuildInputs = [pkgs.pkg-config];
          cargoLock.lockFile = ./Cargo.lock;
        };
    });
}