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:       '')
  
     + lib.optionalString withManual ''# Install man pages
         make -j $NIX_BUILD_CORES -l $NIX_BUILD_CORES USE_ASCIIDOCTOR=1 PERL_PATH="${buildPackages.perl}/bin/perl" cmd-list.made install install-html \
           -C Documentation ''
  
     + (if guiSupport then ''
  
negative.code:       }
  
        # Install git-subtree.
        make -C contrib/subtree install ${lib.optionalString withManual "install-doc"}
        rm -rf contrib/subtree
  
        # Install contrib stuff.
  