pylon:
That's not a standard Arduino library so you cannot install it in the libraries folder.
I see. I was not aware of that.
As I wrote, I installed them in "hardware/tools/avr/lib/avr/include/" (I have a Linux system, your path may vary).
Yes, literally. The header files themselves went into that directory (along with some system headers) and that seems to have fixed the problem. On my system (also Linux) the full path is:
/home/hbarta/arduino-1.0.5/hardware/tools/avr/lib/avr/include/include That makes me wonder why Andy Brown had the files in a directory structure. Perhaps he had a different build environment.
Thank you for your help.