anchor.diff:  , docbook-xsl
   , fetchurl
   , gettext
  -, glibcLocales
   , libxslt
   , makeWrapper
   , perlPackages
  
positive.code:     url = "https://github.com/mquinson/po4a/releases/download/v${version}/${name}.tar.gz";
      sha256 = "596f7621697f9dd12709958c229e256b56683d25997ac73c9625a2cc0c603d51";
    };
  
    # Perl needs en_US.UTF-8
    LOCALE_ARCHIVE = "${glibcLocales}/lib/locale/locale-archive";
  
    nativeBuildInputs = [
      docbook_xml_dtd_412
  
negative.code:   '';
  
    buildPhase = ''
      perl Build
    '';
  
    installPhase = ''
  