{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    nix-systems.url = "github:nix-systems/default-linux";
    unf.url = "git+https://git.atagen.co/atagen/unf";
  };

  outputs =
    inputs:
    with inputs;
    let
      version = builtins.toString self.lastModified;
      collectPkgs = builtins.attrValues;
      forEachSystem =
        function:
        nixpkgs.lib.genAttrs (import nix-systems) (system: function nixpkgs.legacyPackages.${system});
      deps = forEachSystem (pkgs: {
        build = collectPkgs {
          inherit (pkgs.ocamlPackages)
            dune_3
            ocaml
            ;
        };
        dev = collectPkgs {
          inherit (pkgs.ocamlPackages)
            utop
            ocaml-lsp
            ocamlformat
            ocamlformat-rpc-lib
            ;
        };
      });
    in
    {
      devShells = forEachSystem (pkgs: {
        default = pkgs.mkShell {
          packages = pkgs.lib.mapAttrsToList (_: v: v) deps.${pkgs.system};
          shellHook =
            let
              justFile = ''
                default:
                  @just --list

                @build:
                  nix build .#debug --offline

                @release:
                  nix build --offline

                @test:
                  printf "\\n\\n\\t************ running nix+dune tests ************\\n\\n\\n"
                  nix flake check --offline
              '';
            in
            ''
              printf '${justFile}' > justfile
            '';
        };
      });

      packages = forEachSystem (pkgs: {
        default = pkgs.callPackage ./nix/default.nix {
          buildInputs = deps.${pkgs.system}.build;
          inherit version;
        };
        docs = pkgs.callPackage unf.lib.pak-chooie {
          inherit self;
          projectName = "meat";
          newPath = "https://git.atagen.co/atagen/meat/src";
          modules = [
            self.nixosModules.meat
          ];
        };
      });

      nixosModules.meat =
        {
          pkgs,
          lib,
          ...
        }:
        {
          imports = [ ./nix/module.nix ];
          programs.meat.package = self.packages.${pkgs.system}.default;
        };

    };
}