anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchurl
   , glib
   , gmime3
  
positive.code: , gobject-introspection
  , gpgme
  , gtk3
  , gtksourceview
  , gtkspell3
  , intltool
  , libcanberra-gtk3
  
negative.code:     gnutls
      gpgme
      gtk3
      gtksourceview4
      gtkspell3
      libcanberra-gtk3
      libesmtp
  