anchor.diff:    };
     pak64 = fetchurl {
       url = "mirror://sourceforge/simutrans/pak64/${ver_h2}/simupak64-${ver_h2}.zip";
  -    sha256 = "1197rl2534wx9wdafarlr42qjw6pyghz4bynq2g68pi10h8csypw";
  +    sha256 = "1ng963n2gvnwmsj73iy3gp9i5iqf5g6qk1gh1jnfm86gnjrsrq4m";
     };
     pak128 = fetchurl {
       url = "mirror://sourceforge/simutrans/pak128/pak128%20for%20${ver_1}/pak128-2.2.0--${ver_1}.0.zip";
  
positive.code:   result = withPak (mkPak pak128);
  
    ver_1 = "112";
    ver_2 = "1";
    ver_h2 = "${ver_1}-${ver_2}";
  
    # "pakset" of objects, images, text, music, etc.
  
negative.code: 
      src = fetchurl {
        url = "mirror://sourceforge/simutrans/simutrans/${ver_h2}/simutrans-src-${ver_h2}.zip";
        sha256 = "0jdq2krfj3qsh8dks9ixsdvpyjq9yi80p58b0xjpsn35mkbxxaca";
      };
      sourceRoot = ".";
  
  