C:\Arduino\arduino-1.5.1r2/hardware/tools/avr/bin/avrdude -CC:\Arduino\arduino-1.5.1r2/hardware/tools/avr/etc/avrdude.conf -q -q -pattiny13 -cstk500v1 -PCOM6 -b9600 -e -Ulock:w:0x3F:m -Uefuse:w:{bootloader.extended_fuses}:m -Uhfuse:w:0xFF:m -Ulfuse:w:0x2A:m
"efuse" memory type not defined for part "ATtiny13"
Argh!!! I've been playing with version 1.5 for three hours and I already hate it!