anchor.diff:  { stdenv, fetchurl, pkgconfig, intltool, glib, gtk3, gmime, gnutls,
  -  webkitgtk, libesmtp, openssl, libnotify, enchant, gpgme,
  +  webkitgtk, libesmtp, openssl, libnotify, gtkspell3, gpgme,
     libcanberra-gtk3, libsecret, gtksourceview, gobjectIntrospection,
     hicolor-icon-theme, wrapGAppsHook
   }:
  
positive.code:     "--with-ssl"
      "--with-unique"
      "--without-gnome"
    ];
  
    NIX_CFLAGS_COMPILE = "-I${glib.dev}/include/gio-unix-2.0";
  
negative.code:     webkitgtk
      openssl
      libnotify
      gtkspell3
      gpgme
      libcanberra-gtk3
      gtksourceview
  