anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "libxmlb";
  -  version = "0.1.11";
  +  version = "0.1.13";
   
     outputs = [ "out" "lib" "dev" "devdoc" "installedTests" ];
   
  
positive.code:     owner = "hughsie";
      repo = "libxmlb";
      rev = version;
      sha256 = "1503v76w7543snqyjxykiqa5va62zb0ccn3jlw0gpdx8973v80mr";
    };
  
    patches = [
      # Fix installed tests
      # https://github.com/hughsie/libxmlb/pull/2
      (fetchpatch {
        url = "https://github.com/hughsie/libxmlb/commit/78850c8b0f644f729fa21e2bf9ebed0d9d6010f3.diff";
        sha256 = "0zw7c6vy8hscln7za7ijqd9svirach3zdskvbzyxxcsm3xcwxpjm";
      })
  
      ./installed-tests-path.patch
    ];
  
  
negative.code: { stdenv
  , fetchFromGitHub
  , docbook_xml_dtd_43
  , docbook_xsl
  , glib
  