+                       #if (!defined(NO_INTERNAL_SERIAL) && \
+                            (defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1287__) || \
+                             defined(__AVR_ATmega32U6__) || defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB1286__) ||  \
+                             defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U2__)  || defined(__AVR_ATmega8U2__)))