anchor.diff:  
     sources10Zip = fetchurl {
       url = http://files.pharo.org/sources/PharoV10.sources.zip;
  -    md5 = "3476222a0345a6f8f8b6093b5e3b30fb";
  +    sha256 = "0aijhr3w5w3jzmnpl61g6xkwyi2l1mxy0qbvr9k3whz8zlrsijh2";
     };
   
     sources20Zip = fetchurl {
       url = http://files.pharo.org/sources/PharoV20.sources.zip;
  -    md5 = "a145b0733f9d68d9ce6a76270b6b9ec8";
  +    sha256 = "1xsc0p361pp8iha5zckppw29sbapd706wbvzvgjnkv2n6n1q5gj7";
     };
   
     sources30Zip = fetchurl {
       url = http://files.pharo.org/sources/PharoV30.sources.zip;
  -    md5 = "bb0a66b8968ef7d0da97ec86331f68c8";
  +    sha256 = "08d9a7gggwpwgrfbp7iv5896jgqz3vgjfrq19y3jw8k10pva98ak";
  +  };
  +
  +  sources40Zip = fetchurl {
  +    url = http://files.pharo.org/sources/PharoV40.sources.zip;
  +    sha256 = "1xq1721ql19hpgr8ir372h92q7g8zwd6k921b21dap4wf8djqnpd";
     };
   
     # Building
  
positive.code: 
  stdenv.mkDerivation rec {
  
    version = "2014.11.29";
  
    name = "pharo-vm-core-i386-${version}";
    system = "x86_32-linux";
  
negative.code:     unzip ${sources10Zip} -d $prefix/lib/pharo-vm/
      unzip ${sources20Zip} -d $prefix/lib/pharo-vm/
      unzip ${sources30Zip} -d $prefix/lib/pharo-vm/
      unzip ${sources40Zip} -d $prefix/lib/pharo-vm/
    '';
  
    buildInputs = [ bash unzip cmake glibc openssl gcc mesa freetype xlibs.libX11 xlibs.libICE xlibs.libSM alsaLib cairo ];
  