anchor.diff:      };
   
       df = fetchurl {
  -      url = "http://www.bay12games.com/dwarves/df_40_15_linux.tar.bz2";
  -      sha256 = "1mmz7mnsm2y5n2aqyf30zrflyl58haaj6p380pi4022gbd13mnsn";
  +      url = "http://www.bay12games.com/dwarves/df_${baseVersion}_${patchVersion}_linux.tar.bz2";
  +      sha256 = "0045ac9wz1spm4yajrnq5v802ks7aajk422zqkhsd331s1fhpirc";
       };
     };
   
  
positive.code: /* set copyDataDirectory as true by default since df 40 does not seem to run without it */
  
  let
  
    srcs = {
      df_unfuck = fetchgit {
        url = "https://github.com/svenstaro/dwarf_fortress_unfuck";
  
negative.code: assert stdenv.system == "i686-linux";
  
  stdenv.mkDerivation rec {
    name = "dwarf-fortress-0.${baseVersion}.${patchVersion}";
  
  
    buildInputs = [ SDL SDL_image SDL_ttf gtk2 glib glew mesa ncurses openal glibc libsndfile pango atk cmake gdk_pixbuf];
  