There has been an unfortunate dependency between the Ports library and the RF12 library for some time now, causing the Arduino IDE to generate errors such as these:
(etc…)
The workaround right now is to include both in your sketch, even if you only need one:
I’ve been planning to do a major overhaul of the library and software in general, but until then this is the way to avoid those pesky errors. It probably affects quite a few sample sketches on this weblog.
Another thing to watch out for (thanks, Ian!) is that some older examples on this weblog use the JeeNode v2 or even v1, which have a different pinout. To uses those examples with the latest JeeNodes, you have to swap pins 4 and 5, i.e. +3V and AIO.
Please let me know when examples from earlier weblog posts don’t work as described. A small fix and note added to these posts might be all that is needed!