iMac-C2D:~ imacmaster$ cd /Users/imacmaster/Desktop/xnu-1048-semthex/ 
iMac-C2D:~/Desktop/xnu-1048-semthex imacmaster$ patch -p0 <semthex.diff
can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff -ruN xnu-1048-semthex/bsd/kern/kern_descrip.c nebukadnezar_sse3_final/bsd/kern/kern_descrip.c
|--- xnu-1048-semthex/bsd/kern/kern_descrip.c   2006-10-06 07:36:12.000000000 +0000
|+++ nebukadnezar_sse3_final/bsd/kern/kern_descrip.c    2006-12-24 11:28:45.000000000 -0100
--------------------------
File to patch: _