anchor.diff:        outputFile = "languages-frameworks/r.xml";
       }
     + ''
  -    echo ${nixpkgsVersion} > .version
  +    echo ${lib.nixpkgsVersion} > .version
   
       # validate against relaxng schema
       xmllint --nonet --xinclude --noxincludenode manual.xml --output manual-full.xml
  -    ${jing}/bin/jing ${docbook5}/xml/rng/docbook/docbook.rng manual-full.xml
  +    ${pkgs.jing}/bin/jing ${pkgs.docbook5}/xml/rng/docbook/docbook.rng manual-full.xml
   
       dst=$out/share/doc/nixpkgs
       mkdir -p $dst
       xsltproc $xsltFlags --nonet --xinclude \
         --output $dst/manual.html \
  -      ${docbook5_xsl}/xml/xsl/docbook/xhtml/docbook.xsl \
  +      ${pkgs.docbook5_xsl}/xml/xsl/docbook/xhtml/docbook.xsl \
         ./manual.xml
   
       cp ${./style.css} $dst/style.css
   
       mkdir -p $dst/images/callouts
  -    cp "${docbook5_xsl}/xml/xsl/docbook/images/callouts/"*.gif $dst/images/callouts/
  +    cp "${pkgs.docbook5_xsl}/xml/xsl/docbook/images/callouts/"*.gif $dst/images/callouts/
   
       mkdir -p $out/nix-support
       echo "doc manual $dst manual.html" >> $out/nix-support/hydra-build-products
  +
  +    xsltproc $xsltFlags --nonet --xinclude \
  +      --output $dst/epub/ \
  +      ${pkgs.docbook5_xsl}/xml/xsl/docbook/epub/docbook.xsl \
  +      ./manual.xml
  +
  +    cp -r $dst/images $dst/epub/OEBPS
  +    echo "application/epub+zip" > mimetype
  +    zip -0Xq  "$dst/Nixpkgs Contributors Guide - NixOS community.epub" mimetype
  +    zip -Xr9D "$dst/Nixpkgs Contributors Guide - NixOS community.epub" $dst/epub/*
     '';
   }
  
positive.code: with import ./.. { };
  with lib;
  let
    sources = sourceFilesBySuffices ./. [".xml"];
    sources-langs = ./languages-frameworks;
  in
  stdenv.mkDerivation {
    name = "nixpkgs-manual";
  
  
    buildInputs = [ pandoc libxml2 libxslt ];
  
    xsltFlags = ''
      --param section.autolabel 1
  
negative.code:       extraHeader = ''xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" '';
      in ''
        {
          pandoc '${inputFile}' -w docbook ${lib.optionalString useChapters "--chapters"} \
            --smart \
            | sed -e 's|<ulink url=|<link xlink:href=|' \
                -e 's|</ulink>|</link>|' \
  