anchor.diff:  
     buildInputs = [ocaml which findlib ocaml_react ocaml_ssl ocaml_lwt
     ocamlnet ocaml_pcre cryptokit tyxml ipaddr zlib libev openssl
  -  ocaml_sqlite3 tree uutf];
  +  ocaml_sqlite3 tree uutf makeWrapper ];
   
     configureFlags = "--root $(out) --prefix /";
   
  
positive.code:   postFixup =
    ''
    rm -rf $out/var/run
    '';
  
    dontPatchShebangs = true;
  
negative.code: {stdenv, fetchurl, ocaml, findlib, which, ocaml_react, ocaml_ssl,
  ocaml_lwt, ocamlnet, ocaml_pcre, cryptokit, tyxml, ipaddr, zlib,
  libev, openssl, ocaml_sqlite3, tree, uutf, makeWrapper
  }:
  
  let mkpath = p: n:
    let v = stdenv.lib.getVersion ocaml; in
    "${p}/lib/ocaml/${v}/site-lib/${n}";
  in
  
  stdenv.mkDerivation {
    name = "ocsigenserver-2.5";
  