anchor.diff:  
       src = fetchurl {
         url = "mirror://sourceforge/simutrans/simutrans/${ver_h2}/simutrans-src-${ver_h2}.zip";
  -      sha256 = "1xrxpd5m2dc9bk8w21smfj28r41ji1qaihjwkwrifgz6rhg19l5c";
  +      sha256 = "0jdq2krfj3qsh8dks9ixsdvpyjq9yi80p58b0xjpsn35mkbxxaca";
       };
       sourceRoot = ".";
   
  
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:   };
    pak64 = fetchurl {
      url = "mirror://sourceforge/simutrans/pak64/${ver_h2}/simupak64-${ver_h2}.zip";
      sha256 = "1ng963n2gvnwmsj73iy3gp9i5iqf5g6qk1gh1jnfm86gnjrsrq4m";
    };
    pak128 = fetchurl {
      url = "mirror://sourceforge/simutrans/pak128/pak128%20for%20${ver_1}/pak128-2.2.0--${ver_1}.0.zip";
  