This thread might be helpful too: http://lists.gnu.org/archive/html/avr-libc-dev/2005-02/msg00117.html Harald At 18:39 14.02.2005 +0100, you wrote: >hi > >avr-libc has upgraded to version 1.2.2 in the meantime. > >a first try tells me, that at least some #includes would need to be >changed in nut/os to >compile against 1.2.2.