nrf24l01+ with an attiny84

Hi,

I've succesfully gotten the nrf24l01 to communicate between two arduino's using the
pin connection table in the following post and the RH24 examples

http://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo

Next I wanted to switch one of the Arduino's with an attiny84 connected to the NRF.
I'm trying to use the mirf package to communicate from the attiny radio to the ardino radio, but I'm not having much luck.

I know the code is running on the attiny84, because I'm switching a led on/off every cycle.

The setup on the attiny84 is inspired by

http://nathan.chantrell.net/20130810/experimenting-with-the-nrf24l01-2-4ghz-radios/

There are lots of talks about having to modify SPI85.cpp, but despite trying quite a few things I'm stuck.

Can someone point me to a step by step guide to how to connect the nrf24l01 to attiny84?

Merry Christmas