anchor.diff:    configureFlags = [
       "--enable-unix"
       "--enable-thread"
  -    "--enable-bigarray"
  -    "--enable-advanced"
       "--enable-tests"
  +    "--enable-docs"
       "--disable-bench"
     ];
   
  
positive.code:   mkpath = p:
        "${p}/lib/ocaml/${ocaml.version}/site-lib";
  
    version = "0.22";
  
  in
  
  
negative.code:     owner = "c-cube";
      repo = "ocaml-containers";
      rev = "${version}";
      sha256 = "0k1676bn12hhayjlpy8bxfc3sgq6wd7zkh0ca700zh8jxjrshjqk";
    };
  
    buildInputs = [ ocaml findlib ocamlbuild cppo gen sequence qtest ounit ocaml_oasis qcheck ];
  