Hi. I tried building Linux Kernel 3.4 from the source on Ubuntu 10.04 (Linux LAPTOP 2.6.32-21-generic #32-Ubuntu), gcc 4.4.3 on Intel processor. Here's the output: make[1]: Nothing to be done for `all'. make[1]: Nothing to be done for `relocs'. CHK include/linux/version.h CHK include/generated/utsrelease.h CALL scripts/checksyscalls.sh CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o LD init/built-in.o CC arch/x86/kernel/signal.o arch/x86/kernel/signal.c:260: error: ‘__NR_sigreturn’ undeclared here (not in a function) arch/x86/kernel/signal.c:271: error: ‘__NR_rt_sigreturn’ undeclared here (not in a function) arch/x86/kernel/signal.c: In function ‘do_signal’: arch/x86/kernel/signal.c:798: error: ‘__NR_restart_syscall’ undeclared (first use in this function) arch/x86/kernel/signal.c:798: error: (Each undeclared identifier is reported only once arch/x86/kernel/signal.c:798: error: for each function it appears in.) make[2]: *** [arch/x86/kernel/signal.o] Error 1 make[1]: *** [arch/x86/kernel] Error 2 make: *** [arch/x86] Error 2