anchor.diff:  { lib, stdenv, fetchurl, openssl, pkg-config, libnl
   , nixosTests, wpa_supplicant_gui
  -, withDbus ? true, dbus
  +, dbusSupport ? true, dbus
   , withReadline ? true, readline
   , withPcsclite ? true, pcsclite
   , readOnlyModeSSIDs ? false
  
positive.code:   '';
  
    buildInputs = [ openssl libnl ]
      ++ optional withDbus dbus
      ++ optional withReadline readline
      ++ optional withPcsclite pcsclite;
  
  
negative.code:     CONFIG_EAP_AKA=y
      CONFIG_EAP_AKA_PRIME=y
      CONFIG_PCSC=y
    '' + optionalString dbusSupport ''
      CONFIG_CTRL_IFACE_DBUS=y
      CONFIG_CTRL_IFACE_DBUS_NEW=y
      CONFIG_CTRL_IFACE_DBUS_INTRO=y
  