anchor.diff:    # src/weather_data.cpp:203:1: fatal error: opening dependency file obj/tiles/weather_data.d: No such file or directory
     # make: *** [Makefile:687: obj/tiles/weather_data.o] Error 1
     enableParallelBuilding = false;
  +
  +  dontStrip = debug;
   
     meta = with stdenv.lib; {
       description = "A free, post apocalyptic, zombie infested rogue-like";
  
positive.code: { fetchFromGitHub, stdenv, pkgconfig, ncurses, lua, SDL2, SDL2_image, SDL2_ttf,
  SDL2_mixer, freetype, gettext, CoreFoundation, Cocoa,
  tiles ? true }:
  
  stdenv.mkDerivation rec {
    version = "2018-07-15";
  
negative.code:   makeFlags = with stdenv.lib; [
      "PREFIX=$(out)"
      "LUA=1"
      "USE_HOME_DIR=1"
      "LANGUAGES=all"
      "VERSION=git-${version}-${substring 0 8 src.rev}"
  