anchor.diff:  
   stdenv.mkDerivation rec {
     name = "${pname}-${version}";
  -  version = "1.1.1";
  +  version = "1.2.1";
   
     src = fetchurl {
  -    url = "https://forge.ocamlcore.org/frs/download.php/870/${pname}-${version}.tar.gz";
  -    sha256 = "f896fa101a05d81b85af8122fe1c2809008a5e5fdca00f9ceeb7eec356369e3a";
  +    url = "http://ygrek.org.ua/p/release/ocaml-mysql/${name}.tar.gz";
  +    sha256 = "06mb2bq7v37wn0lza61917zqgb4bsg1xxb73myjyn88p6khl6yl2";
     };
   
     configureFlags = [ 
  
positive.code:      "--libdir=$out/lib/ocaml/${ocaml.version}/site-lib/mysql"
    ];
  
    buildInputs = [ocaml findlib camlp4 ];
  
    createFindlibDestdir = true;
  
    propagatedBuildInputs = [ mysql.client ];
  
    buildPhase = ''
      make
      make opt
    '';
  
    meta = {
      homepage = http://ocaml-mysql.forge.ocamlcore.org;
  
negative.code: { stdenv, fetchurl, ocaml, findlib, mysql }:
  
  # TODO: la versione stabile da' un errore di compilazione dovuto a
  # qualche cambiamento negli header .h
  