anchor.diff:        "--disable-crashreporter"
         "--disable-tests"
         "--disable-necko-wifi" # maybe we want to enable this at some point
  -      "--disable-installer" 
  +      "--disable-installer"
         "--disable-updater"
       ];
   
   
     xulrunner = stdenv.mkDerivation rec {
       name = "xulrunner-${xulVersion}";
  -    
  +
       inherit src;
   
       buildInputs =
  
positive.code:       ] ++ commonConfigureFlags;
  
      enableParallelBuilding = true;
        
      preConfigure =
        ''
          export NIX_LDFLAGS="$NIX_LDFLAGS -L$out/lib/xulrunner-${xulVersion}"
  
negative.code:     preConfigure =
        ''
          find . -name Makefile.in -execdir sed -i '{}' -e '1ivpath %.so ${
            stdenv.lib.concatStringsSep ":"
              (map (s : s + "/lib") (buildInputs ++ [stdenv.gcc.libc]))
          }' ';'
        '';
  