anchor.diff:    meta = {
       description = "Rogue-like game";
       license = stdenv.lib.licenses.unfree;
  +    broken = true; # broken in runtime, will not get pass character generation
     };
   }
  
positive.code: { stdenv, fetchurl, ncurses, flex, bison, autoconf, automake, m4, coreutils }:
  
  stdenv.mkDerivation rec {
    name = "zangband-${version}";
    version = "2.7.3";
  
    src = fetchurl {
      url = "ftp://ftp.sunet.se/pub/games/Angband/Variant/ZAngband/zangband-${version}.tar.gz";
      sha256 = "0654m8fzklsc8565sqdad76mxjsm1z9c280srq8863sd10af0bdq";
    };
  
    buildInputs = [
      ncurses flex bison autoconf automake m4
    ];
  
    # fails during chmod due to broken permissions
    dontMakeSourcesWritable = true;
    postUnpack = ''
      chmod a+rwX -R .
    '';
  
    preConfigure = ''
      sed -re 's/ch(own|grp|mod)/true/' -i lib/*/makefile.zb makefile.in
      sed -e '/FIXED_PATHS/d' -i src/z-config.h
      ./bootstrap
    '';
  
    preInstall = ''
  
negative.code:       cd "$ZANGBAND_PATH"
        for i in $(find "$ORIG_PATH" -type f); do
          REL_PATH="''${i#$ORIG_PATH/}"
          mkdir -p "$(dirname "$REL_PATH")"
          ln -s "$i" "$REL_PATH" &>/dev/null
        done
        mkdir -p lib/user lib/save
        for i in lib/*/*.raw; do
  