anchor.diff:  { stdenv
   , fetchurl
   , glib
  -, gmime
  +, gmime3
   , gnutls
   , gobject-introspection
   , gpgme
  
positive.code:     gtkspell3
      libcanberra-gtk3
      libesmtp
      libnotify
      libsecret
      openssl
  
negative.code: 
    buildInputs = [
      glib
      gmime3
      gnutls
      gpgme
      gtk3
  