I’m using Linux and the 2.0.4 IDE with a Duemilanove to try to program the ATTiny with. Here is the error I get:
Blink.ino:10:21: Fatal Error: Arduino.h: No such file or directory. Compilation terminated.
I can code all I want with an Uno or Duemilanove just fine. I put on the Duemilanove the needed ISP sketch and wired up the ATTiny and got that error when testing the blink sketch on the ATTiny. Where do you find that arduino.h file?