anchor.diff:  
     makefile = "Makefile.std";
   
  -  prePatch = ''
  +  postPatch = ''
       # Allow usage of ANGBAND_PATH
       substituteInPlace config.h --replace "#define FIXED_PATHS" ""
     '';
  
positive.code:   src = fetchzip {
      url = "http://www.amirrorclear.net/flowers/game/sil/Sil-130-src.zip";
      sha256 = "1amp2mr3fxascra0k76sdsvikjh8g76nqh46kka9379zd35lfq8w";
      stripRoot=false;
    };
  
    nativeBuildInputs = [ makeWrapper ];
  
negative.code: { pkgs, lib, stdenv, fetchzip, ncurses, libX11, libXaw, libXt, libXext, libXmu
  , makeWrapper, writeScript }:
  
  let
    setup = writeScript "setup" ''
      mkdir -p "$ANGBAND_PATH"
  