Steve, libnutarch.a needs to be added to the libs. See http://www.ethernut.de/en/iccavr/ for updated informations. Harald At 20:13 22.03.2006 -0800, you wrote: >I just upgraded to Nut 4.0.2. >When i try and compile my existing code in ICC i get the following errors. > >!ERROR file 'timer.o': undefined symbol '_NutGetTickClock'