ATtiny85 problem. Selected board depends on 'arduino' core. Not installed.

I have successfully used attiny to make a led blink.
Then I updated the arduino software and now it does not work anymore.

I have uploaded the ISP to arduino, connected the wires, put arduino Deumilanove as ISP, picked my ATtiny85 (with internall 8MHz clock) as output. And it keeps bugging me with this error. Even when I'm not having include android in the start.

#include <arduino.h>

void setup() {
  
}

void loop() {
  int val = analogRead(7);
  if (val > 500){
    analogWrite(6,HIGH);
   } else {
     analogWrite(6,LOW);
     
   }
}

I am STUCK!
Please help a fello man get back up :confused:

As far as I know none of the attiny cores has been update to use Arduino 1.5.4.

I use version 1.05

I actually manage to get it working :smiley: :smiley:
Heres a link to the 1.5 compatible ATtiny programing stuff :
https://github.com/damellis/attiny/tree/ide-1.5.x