[root@localhost arp]# make
make -C /lib/modules/2.4.20-8/build SUBDIRS=/root/arp modules
make[1]: Entering directory `/usr/src/linux-2.4.20-8'
make -r -f tmp_include_depends all
make[2]: Entering directory `/usr/src/linux-2.4.20-8'
touch: creating `/usr/src/build/231485-i386/install/usr/src/linux-2.4.20-8/fs/jfs/jfs_debug.h': No such file or directory
make[2]: *** [/usr/src/build/231485-i386/install/usr/src/linux-2.4.20-8/fs/jfs/jfs_debug.h] Error 1
make[2]: Leaving directory `/usr/src/linux-2.4.20-8'
make[1]: *** [tmp_include_depends] Error 2
make[1]: Leaving directory `/usr/src/linux-2.4.20-8'
make: *** [default] Error 2

need help, thanks alot!

What exactly are you trying to do? And how are you trying to do it?

I found my LAN have serious ARP Snoofing, But I don't know who did it, so I want to protect my ARP with the software ARPstar, after download it I follow the Installing instruction to install that, I got the error above. my system is redhat 9 kernel 2.6.0. any ideas??

Well, there's definitely kernel issues. You say "kernel 2.6.0", but in your original post, make is print errors about kernel 2.4.20-8. Which kernel are you running? Do you have the corresponding kernel source package installed?

well, actually i have linux 2.6.0 installed, but I can't enter it, once I choose it from the GRUB, it show somthing like
kernel panic : no init found ,try passing init = option to kernel.............
so I enter the 2.4 instead of the 2.6. so the problem was happen at 2.4.

I have edited the title for this thread. Please use better titles for your threads because this helps others know exactly what your thread is about.