{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc861", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  provideOldHaskellAttributeNames = true;

  aff = with haskellPackages; callPackage(
    { mkDerivation, base, bytestring, clock, containers, fetchgit, glib
    , linear, monad-loops, monad-parallel, mtl, OpenGL, stdenv
    , stm, text, uuid, vector
    }:
    mkDerivation {
      pname = "affection";
      version = "0.0.0.9";
      sha256 = "d9feed3eed54ad2ae61ebc560af8761959cb4dc46c2bbf5a804f586b9244cb4e";
      configureFlags = [ "-fdebug" ];
      isLibrary = true;
      isExecutable = true;
      libraryHaskellDepends = [
        base bytestring clock containers glib linear monad-loops
        monad-parallel mtl OpenGL sdl stm text uuid vector
      ];
      homepage = "https://github.com/nek0/affection#readme";
      description = "A simple Game Engine using SDL";
      license = stdenv.lib.licenses.lgpl3;
    }) {};

  sdl = with haskellPackages; callPackage(
    { mkDerivation, base, bytestring, deepseq, exceptions, linear
    , StateVar, stdenv, text, transformers, vector, weigh, pkgconfig
    }:
    mkDerivation {
      pname = "sdl2";
      version = "2.4.1.0";
      sha256 = "21a569c0c19f8ff2bbe1cf1d3eb32f65e8143806de353cedd240df5e9d088b5c";
      isLibrary = true;
      isExecutable = true;
      enableSeparateDataOutput = true;
      libraryHaskellDepends = [
        base bytestring exceptions linear StateVar text transformers vector
      ];
      buildDepends = [ pkgconfig ];
      librarySystemDepends = [ nixpkgs.SDL2 pkgconfig ];
      libraryPkgconfigDepends = [ nixpkgs.SDL2 pkgconfig ];
      testHaskellDepends = [ base deepseq linear vector weigh ];
      doCheck = false;
      description = "Both high- and low-level bindings to the SDL library (version 2.0.4+).";
      license = stdenv.lib.licenses.bsd3;
    }) {};

  nano = with haskellPackages; callPackage(
    { mkDerivation, base, bytestring, c2hs, containers, fetchgit
    , glew, hspec, inline-c, libGL, libGLU, QuickCheck, stdenv, text
    , vector
    }:
    mkDerivation {
      pname = "nanovg";
      version = "0.6.0.0";
      src = fetchgit {
        url = "https://github.com/nek0/nanovg-hs.git";
        sha256 = "1lh7y7n97md585y7wic4sn240ifpdmcgfrvyvmmdngaz4s8zy47f";
        rev = "09b613ab382e73e401ed8c2bbf936b39a92a17e1";
        fetchSubmodules = true;
      };
      isLibrary = true;
      isExecutable = true;
      libraryHaskellDepends = [ base bytestring containers text vector ];
      librarySystemDepends = [ glew libGL libGLU ];
      libraryPkgconfigDepends = [ glew ];
      libraryToolDepends = [ c2hs ];
      testHaskellDepends = [ base containers hspec inline-c QuickCheck ];
      homepage = "https://github.com/cocreature/nanovg-hs";
      description = "Haskell bindings for nanovg";
      license = stdenv.lib.licenses.isc;
    }) {};

  f = { mkDerivation, algebraic-graphs, astar, base
      , bytestring, containers, ecstasy, JuicyPixels, JuicyPixels-extra
      , linear, matrix, mtl, OpenGL, random, stdenv, stm
      , text, unordered-containers, vector, pkgconfig
      }:
      mkDerivation {
        pname = "tracer-game";
        version = "0.0.0.0";
        src = ./.;
        isLibrary = false;
        isExecutable = true;
        executableHaskellDepends = [
          aff algebraic-graphs astar base bytestring containers ecstasy
          JuicyPixels JuicyPixels-extra linear matrix mtl nano OpenGL
          random sdl stm text unordered-containers vector pkgconfig
        ];
        enableExecutableProfiling = true;
        license = stdenv.lib.licenses.gpl3;
      };

  haskellPackages = pkgs.haskellPackages;

  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