anchor.diff:      grub
       gzip
       hello
  +    iputils
       jakartaregexp
       jetty
       jikes
  
positive.code:     pkgconfig
      postgresql
      postgresql_jdbc
      python
      qcmm
      qt3
      quake3demo
      readline
      screen
      sdf
      spidermonkey
      strace
      strategoxt
      strategoxtUtils
      subversion
      sylpheed
      tetex
      texinfo
      thunderbird
  
negative.code:     chatzilla
      cksfv
      coreutils
      cpio
      darcs
      db4
      diffutils
  