anchor.diff:      autoconf
       automake19x
       bisonnew
  +    docbook5
       docbook_xml_dtd_42
       docbook_xml_dtd_43
       docbook_xml_xslt
  
positive.code:     aterm
      autoconf
      automake19x
      docbook_xml_dtd_42
      docbook_xml_dtd_43
      docbook_xml_xslt
  
negative.code:     darcs
      db4
      diffutils
      docbook5
      docbook_xml_dtd_42
      docbook_xml_dtd_43
      docbook_xml_xslt
  