[PLUTO-help] compilare kernel 2.6.5

[mane00]

ogni volta che provo a fare un make la compilazione si ferma a

  CC      arch/i386/kernel/asm-offsets.s
In file included from include/asm/system.h:5,
                 from include/asm/processor.h:18,
                 from include/asm/thread_info.h:13,
                 from include/linux/thread_info.h:21,
                 from include/linux/spinlock.h:12,
                 from include/linux/capability.h:45,
                 from include/linux/sched.h:7,
                 from arch/i386/kernel/asm-offsets.c:7:
include/linux/kernel.h:10:20: stdarg.h: No such file or directory
In file included from include/asm/system.h:5,
                 from include/asm/processor.h:18,
                 from include/asm/thread_info.h:13,
                 from include/linux/thread_info.h:21,
                 from include/linux/spinlock.h:12,
                 from include/linux/capability.h:45,
                 from include/linux/sched.h:7,
                 from arch/i386/kernel/asm-offsets.c:7:
include/linux/kernel.h:71: parse error before "va_list"
include/linux/kernel.h:71: warning: function declaration isn't a prototype
include/linux/kernel.h:74: parse error before "va_list"
include/linux/kernel.h:74: warning: function declaration isn't a prototype
include/linux/kernel.h:77: parse error before "va_list"
include/linux/kernel.h:77: warning: function declaration isn't a prototype
include/linux/kernel.h:81: parse error before "va_list"
include/linux/kernel.h:81: warning: function declaration isn't a prototype
make[1]: *** [arch/i386/kernel/asm-offsets.s] Error 1
make: *** [arch/i386/kernel/asm-offsets.s] Error 2

La cosa strana e' che tutto questo e' cominciato dopo aver istallato con 
"successo" un 2.6.3 : ora qualsiasi kernel provo a compilare (anche lo 
stesso 2.6.3, con le stesse impostazioni...) mi ritrovo davanti al 
suddetto errore!!!

idee??

gazie ;)