anchor.diff:  , pkgconfig
   , vala
   , gobject-introspection
  +, gtk-doc
  +, docbook-xsl-nons
  +, docbook_xml_dtd_43
   , glib
   , libgudev
   , libevdev
  
positive.code:     pkgconfig
      vala
      gobject-introspection
    ];
  
    buildInputs = [
      glib
      libgudev
      libevdev
    ];
  
    doCheck = true;
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "libmanette";
    version = "0.2.6";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "1b3bcdkk5xd5asq797cch9id8692grsjxrc1ss87vv11m1ck4rb3";
    };
  
    nativeBuildInputs = [
  