{
  description = "tricu";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        packageName = "tricu";

        haskellPackages = pkgs.haskellPackages;
        hsLib = pkgs.haskell.lib;

        tricuPackage =
          haskellPackages.callCabal2nix packageName self {};

        tricuTests =
          hsLib.overrideCabal tricuPackage (old: {
            doCheck = true;

            configureFlags = (old.configureFlags or []) ++ [
              "--enable-tests"
            ];

            checkPhase = ''
              runHook preCheck
              ./Setup test tricu-tests --show-details=direct
              runHook postCheck
            '';
          });

        customGHC = haskellPackages.ghcWithPackages (hpkgs: with hpkgs; [
          megaparsec
        ]);
      in {
        packages.${packageName} = tricuPackage;
        packages.default = tricuPackage;

        packages.test = tricuTests;

        checks.${packageName} = tricuTests;
        checks.default = tricuTests;

        defaultPackage = self.packages.${system}.default;

        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            haskellPackages.cabal-install
            haskellPackages.ghc-events
            haskellPackages.ghcid
            customGHC
            upx
          ];

          inputsFrom = [
            tricuPackage
          ];
        };
      });
}