Thanks, Cr0sh - changing the include doesn't affect the problem.
I'm just trying to instantiate a NewSoftSerial object when the softxbee constructor is called.Maybe you could find a similar line in your code.
Will try some more. Found:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1211645129
but his solution doesn't seem to help me here.