Build the Toolchain

Hi, all.

I tried to build the Toolchain from the newest nios2-linux-20100621.tar

i followed instruction from nioswiki com InstallNios2Linux

but i was stopted by this massege

make: Entering directory `/root/niosbin/nios2-linux/uClibc'
make: `conf' is up to date.
  CC libpthread/linuxthreads.old/cancel.o
In file included from ./include/sys/syscall.h:34,
                 from libpthread/linuxthreads.old/restart.h:16,
                 from libpthread/linuxthreads.old/cancel.c:23:
./include/bits/syscalls.h:10:23: asm/traps.h: No such file or directory
make: ***  Error 1
make: Leaving directory `/root/niosbin/nios2-linux/uClibc'
make: ***  Error 2

i'm runing CentOS 5.5

gcc version is 4.1.2-48, but there is no newer in repos(

i'd like to build it by myself, plz anybody helps me...

P.S. Have I any problems using prebuild toolchain nios2gcc-20080203.tar.bz2 on my nios2-linux-20100621.tar?