anchor.diff:  
     unpackCmd = "tar xjf $src";
   
  -  inherit (topkg) buildPhase installPhase;
  +  buildPhase = "${topkg.buildPhase} --with-cmdliner false";
  +
  +  inherit (topkg) installPhase;
   
     meta = with stdenv.lib; {
       description = "An OCaml library providing efficient access to a selection of character properties of the Unicode character database";
  
positive.code: 
    src = fetchurl {
      url = "${webpage}/releases/${pname}-${version}.tbz";
      sha256 = "07m7pfpcf03dqsbvqpq88y9hzic8fighlp4fgbav6n6xla35mk5k";
    };
  
    buildInputs = [ ocaml findlib ocamlbuild opam topkg ];
  
    propagatedBuildInputs = [ uchar ];
  
  
negative.code: { stdenv, fetchurl, ocaml, findlib, ocamlbuild, opam, topkg, uchar, uutf, uunf }:
  
  let
    pname = "uucp";
    version = "10.0.1";
    webpage = "http://erratique.ch/software/${pname}";
  in
  
  