anchor.diff:  { lib, stdenv
   , fetchurl
   , autoreconfHook
  -, docbook_xml_dtd_412
   , docbook_xml_dtd_45
   , docbook-xsl-nons
   , which
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "flatpak";
    version = "1.10.1";
  
    # TODO: split out lib once we figure out what to do with triggerdir
    outputs = [ "out" "dev" "man" "doc" "devdoc" "installedTests" ];
  
    src = fetchurl {
      url = "https://github.com/flatpak/flatpak/releases/download/${version}/${pname}-${version}.tar.xz";
      sha256 = "1dywvfpmszvp2wy5hvpzy8z6gz2gzmi9p302njp52p9vpx14ydf1";
    };
  
    patches = [
  
negative.code:   nativeBuildInputs = [
      autoreconfHook
      libxml2
      docbook_xml_dtd_45
      docbook-xsl-nons
      which
  