{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  f = { mkDerivation, aeson, base, base16-bytestring
      , base64-bytestring, bytestring, case-insensitive, containers
      , HsYAML, http-api-data, http-types, iproute, mtl, network, opaleye
      , optparse-applicative, postgresql-simple, product-profunctors
      , profunctors, pureMD5, random-bytestring, servant, servant-rawm
      , servant-server, stdenv, stm, text, time, wai, wai-logger
      , wai-middleware-throttle, warp
      }:
      mkDerivation {
        pname = "mateamt";
        version = "0.0.0.0";
        src = ./.;
        isLibrary = true;
        isExecutable = true;
        libraryHaskellDepends = [
          aeson base base16-bytestring base64-bytestring bytestring
          containers http-api-data http-types mtl opaleye postgresql-simple
          product-profunctors profunctors pureMD5 random-bytestring servant
          servant-rawm servant-server stm text time wai wai-logger warp
        ];
        executableHaskellDepends = [
          base base16-bytestring bytestring case-insensitive containers
          HsYAML iproute mtl network opaleye optparse-applicative
          postgresql-simple servant servant-server stm text time wai
          wai-logger wai-middleware-throttle warp
        ];
        description = "A whole new matemat";
        license = stdenv.lib.licenses.agpl3;
      };

  haskellPackages = if compiler == "default"
                       then pkgs.haskellPackages
                       else pkgs.haskell.packages.${compiler};

  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;

  drv = variant (haskellPackages.callPackage f {});

in

  if pkgs.lib.inNixShell then drv.env else drv