anchor.diff:    inherit (stdenv.lib) optionals versionAtLeast;
   
     pname = "vg";
  -  version = "0.9.0";
  +  version = "0.9.1";
     webpage = "http://erratique.ch/software/${pname}";
   in
   
  
positive.code: 
    src = fetchurl {
      url = "${webpage}/releases/${pname}-${version}.tbz";
      sha256 = "1czd2fq85hy24w5pllarsq4pvbx9rda5zdikxfxdng8s9kff2h3f";
    };
  
    buildInputs = [ ocaml findlib ocamlbuild topkg ];
  
negative.code:     module. An API allows to implement new renderers.
      '';
      homepage = "${webpage}";
      inherit (ocaml.meta) platforms;
      license = licenses.isc;
      maintainers = [ maintainers.jirkamarsik ];
    };
  }
  