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