anchor.diff:          stdenv
           wget
           zlib
  -        lynx
  +        w3m
           poppler
   #        rubyLibs.docsplit
  -        python27Packages.ipdb
  -        docutils
  -        python27Packages.pygments
  +#        python27Packages.ipdb
  +#        docutils
  +#        python27Packages.pygments
           vimprobable2
  -        python27Packages.cssselect
  +#        python27Packages.cssselect
           gettext
           python27Packages.libarchive
   #        python27.modules.curses
  
positive.code: 
          nodePackages.jshint
  
          python27Packages.jinja2
          vimHugeX
        ];
        pathsToLink = [ "/" ];
        ignoreCollisions = true;
  
negative.code:         postgresql
          pycrypto
          python27Full
  #        python27Packages.ipython
          python27Packages.pyyaml
  #        python27Packages.readline
  #        python27Packages.sqlite3
  