Hi Matthias, Try to use the CVS head of NutOS. For the unix plattform I added an include of the original libc unistd.h file. Bye, Ole -- kernel concepts Tel: +49-271-771091-14 Dreisbachstr. 24 Fax: +49-271-771091-19 D-57250 Netphen E+ : +49-177-7420433 --