SoftwareSerial with ATTiny84 using ATtiny library

just the standard:

Binary sketch size: 3,044 bytes (of a 8,192 byte maximum)
avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny85
avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny85

get this with all attiny uploads though.