anchor.diff:      RGtk2 = [ pkgs.pkgconfig ];
       RProtoBuf = [ pkgs.pkgconfig ];
       Rpoppler = [ pkgs.pkgconfig ];
  -    VBmix = [ pkgs.pkgconfig ];
       XML = [ pkgs.pkgconfig ];
       cairoDevice = [ pkgs.pkgconfig ];
       chebpol = [ pkgs.pkgconfig ];
  
positive.code:     udunits2 = [ pkgs.udunits pkgs.expat ];
      V8 = [ pkgs.v8_3_14 ];
      VBLPCM = [ pkgs.gsl_1 ];
      VBmix = [ pkgs.gsl_1 pkgs.fftw pkgs.qt4 ];
      WhopGenome = [ pkgs.zlib.dev ];
      XBRL = [ pkgs.zlib pkgs.libxml2.dev ];
      xml2 = [ pkgs.libxml2.dev ] ++ lib.optionals stdenv.isDarwin [ pkgs.perl ];
  
negative.code:     "EasyqpcR"
      "EcoVirtual"
      "ENiRG"
      "eVenn"
      "exactLoglinTest"
      "fat2Lpoly"
  