anchor.diff:  
     olinkDB = runCommand "manual-olinkdb"
       { inherit sources;
  -      buildInputs = [ libxml2 libxslt ];
  +      nativeBuildInputs = [ buildPackages.libxml2 buildPackages.libxslt ];
       }
       ''
         xsltproc \
  
positive.code:       echo "for hints about the offending path)."
        exit 1
      fi
      ${libxslt.bin}/bin/xsltproc \
        --stringparam revision '${revision}' \
        -o $out ${./options-to-docbook.xsl} $optionsXML
    '';
  
negative.code: 
    manual-combined = runCommand "nixos-manual-combined"
      { inherit sources;
        nativeBuildInputs = [ buildPackages.libxml2 buildPackages.libxslt ];
        meta.description = "The NixOS manual as plain docbook XML";
      }
      ''
  