#include <avr/pgmspace.h>\r
\r
#include <LUFA/Drivers/USB/USB.h>\r
- #include <LUFA/Drivers/USB/Class/Device/CDC.h>\r
+ #include <LUFA/Drivers/USB/Class/CDC.h>\r
+\r
+ #if (USE_INTERNAL_SERIAL == NO_DESCRIPTOR)\r
+ #warning USE_INTERNAL_SERIAL is not available on this AVR - please manually construct a device serial descriptor.\r
+ #endif\r
\r
/* Macros: */\r
/** Endpoint number of the CDC device-to-host notification IN endpoint. */\r