anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
  +, symlinkJoin
   , fetchurl
   , fetchzip
   , sconsPackages
   , zlib
  +, libiconv
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:   '';
  
    nativeBuildInputs = [ sconsPackages.scons_3_1_2 ];
    buildInputs = [ zlib ];
  
    sconsFlags = [
      "SKIPSTUBS=all"
      "SKIPPLUGINS=all"
      "SKIPUTILS=all"
      "SKIPMISC=all"
      "APPEND_CPPPATH=${zlib.dev}/include"
      "APPEND_LIBPATH=${zlib}/lib"
      "NSIS_CONFIG_CONST_DATA=no"
    ];
  
    preBuild = ''
      sconsFlagsArray+=("PATH=$PATH")
    '';
  
    prefixKey = "PREFIX=";
  
negative.code:     description = "A free scriptable win32 installer/uninstaller system that doesn't suck and isn't huge";
      homepage = "https://nsis.sourceforge.io/";
      license = licenses.zlib;
      platforms = platforms.unix;
      maintainers = with maintainers; [ pombeirp ];
    };
  }
  