Arduino as ISP for ATtiny

I found a workaround in an Arduino forum thread

Create an Arduino.h in ...\Arduino\hardware\attiny45_85\cores\attiny45_85 containing

#include <WProgram.h>

I still get warning messages

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

but my tiny multi-million-transistor CPU can now wonderously make a LED blink.

^{somewhere, an AVR engineer is crying into his beer}

It seems that the ATtiny45_85 setup for the Arduino IDE was affected by some sort of reorganisation in the internals when Arduino IDE 1.0 was developed.