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