sources:
  ppp-2.4.1-mppe-crypto.tar.bz2: 9652e5a21131239f6e8499d4dbc448a9eeee132f
  ppp-dhcpc.tar.bz2: 8b49c9b8ccde83f69c4b0c9cae6454cdba0845ca
  ppp-2.4.7.tar.gz: 808b023172ea7189bc0d49935bf37a5382a1fe13