[질문] 2.6에서 2.4 컴파일

2.4 커널을 쓸 때가 있어서 2.4를 설치 중에 있습니다.
make menuconfig --> make dep --> make clean
--> make bzImage --> 모듈 설치

이런식으로 하겠지요?
그런데, make menu config 때 기본적인 것 그러니까 수정하지 않고, 저장만 하고 exit를 했습니다. 즉, 아무것도 건드지 않았지요.
그리고 다음을 했는데, make bzImage 때 아래와 같은 에러가 납니다.
무슨 문제일까요? 저는 프로세서가 하나입니다. ^^ (그문제가 아닐거라는 예상에.. ^^)
고수님들 답변 기다리겠습니다.

[root@Ryan linux]# make bzImage
gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -o scripts/split-include scripts/split-include.c
scripts/split-include include/linux/autoconf.h include/config
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686   -c -o init/main.o init/main.c
In file included from /usr/src/linux/include/linux/sched.h:23,
                 from /usr/src/linux/include/linux/mm.h:4,
                 from /usr/src/linux/include/linux/slab.h:14,
                 from /usr/src/linux/include/linux/proc_fs.h:5,
                 from init/main.c:15:
/usr/src/linux/include/linux/smp.h:29: error: conflicting types for 'smp_send_reschedule'
/usr/src/linux/include/asm/smp.h:39: error: previous declaration of 'smp_send_reschedule' was here
/usr/src/linux/include/linux/smp.h:29: error: conflicting types for 'smp_send_reschedule'
/usr/src/linux/include/asm/smp.h:39: error: previous declaration of 'smp_send_reschedule' was here
In file included from /usr/src/linux/include/linux/unistd.h:9,
                 from init/main.c:17:
/usr/src/linux/include/asm/unistd.h:345: warning: conflicting types for built-in function '_exit'