anchor.diff:  
     macportSrc = fetchurl {
       url = "ftp://ftp.math.s.chiba-u.ac.jp/emacs/${name}.tar.gz";
  -    sha256 = "0p4jh6s1qi6jm6zr82grk65x33ix1hb0fbpih4vh3vnx6310iwsb";
  +    sha256 = "1kryg4xw2jn2jwd9ilm2snjvgmnbbp392ry1skzl4d4xf7ff3vx1";
     };
   
     enableParallelBuilding = true;
  
positive.code:       separately.
  
        This is "Mac port" addition to GNU Emacs 24. This provides a native
        GUI support for Mac OS X 10.4 - 10.9. Note that Emacs 23 and later
        already contain the official GUI support via the NS (Cocoa) port for
        Mac OS X 10.4 and later. So if it is good enough for you, then you
        don't need to try this.
  
negative.code: 
  stdenv.mkDerivation rec {
    emacsName = "emacs-24.5";
    name = "${emacsName}-mac-5.12";
  
    #builder = ./builder.sh;
  
  