anchor.diff:      mktemp
       mono
       mysql
  -#    nix
  +    nix
       nxml
   #    octave
       openssl
  
positive.code:     tetex
      texinfo
      thunderbird
      transformers
      uml
      unzip
  
negative.code:     bmp_plugin_musepack
      bsdiff
      bzip2
      chatzilla
      cksfv
      coreutils
      darcs
  