anchor.diff:      automake autoconf libtool
       file
       intltool
  -    vala_0_32
  +    vala_0_34
       gnome3.yelp_tools
       wrapGAppsHook
     ];
  
positive.code: 
    preConfigure = ''
      NOCONFIGURE=true ./autogen.sh
      chmod +x configure;
      substituteInPlace configure --replace "/usr/bin/file" "${file}/bin/file"
    '';
  
  
negative.code:     json_glib
      sqlite
      itstool
      librsvg
      gnome3.gtk
      gnome3.gucharmap
      gnome3.libgee
  