anchor.diff:    '';
   
     nativeBuildInputs = [ gettext perlPackages.perl makeWrapper ]
  -    ++ lib.optionals withManual [ asciidoctor texinfo xmlto docbook2x
  -         docbook_xsl docbook_xsl_ns docbook_xml_dtd_45 libxslt ];
  +    ++ lib.optionals withManual [ asciidoc texinfo xmlto docbook2x
  +         docbook_xsl docbook_xml_dtd_45 libxslt ];
     buildInputs = [curl openssl zlib expat cpio libiconv]
       ++ lib.optionals perlSupport [ perlPackages.perl ]
       ++ lib.optionals guiSupport [tcl tk]
  
positive.code:       }
  
        # Install git-subtree.
        make -C contrib/subtree install ${lib.optionalString withManual "USE_ASCIIDOCTOR=1 install-doc"}
        rm -rf contrib/subtree
  
        # Install contrib stuff.
  
negative.code: , curl, openssl, zlib, expat, perlPackages, python3, gettext, cpio
  , gnugrep, gnused, gawk, coreutils # needed at runtime by git-filter-branch etc
  , openssh, pcre2
  , asciidoc, texinfo, xmlto, docbook2x, docbook_xsl, docbook_xml_dtd_45
  , libxslt, tcl, tk, makeWrapper, libiconv
  , svnSupport, subversionClient, perlLibs, smtpPerlLibs
  , perlSupport ? true
  