Busybox failed to build

I choose embedded target. But config file did not include busybox. I changed the config file like this:
X -1-------- 163.500 base busybox 1.6.1 / base/system CROSS INIT 0
but it is failed to build. end up  with error:
== 10:36:18 =[1]=> Building base/busybox [1.6.1 7.0-rc2].
-> Parallel build using 2 jobs enabled.
-> Preparing configuration to build this package with dietlibc (statically).
-> Using default dietlibc options!
-> Reading package config: package/base/busybox/busybox.conf
-> Preparing build in src.busybox.niv.20080115.103618.3674.nameserver
-> Building. Writing output to $root/var/adm/logs/1-busybox.out
!> libbb/loop.c:50: warning: unused variable 'loopinfo'
!> libbb/loop.c: In function 'set_loop':
!> libbb/loop.c:85: error: storage size of 'loopinfo' isn't known
!> libbb/loop.c:118: error: 'LOOP_GET_STATUS64' undeclared (first use in this ..
!> libbb/loop.c:127: error: 'LOOP_SET_STATUS64' undeclared (first use in this ..
!> libbb/loop.c:85: warning: unused variable 'loopinfo'
!> Due to previous errors, no 1-busybox.log file!
!> (Try enabling xtrace in the config to track an error inside the build syst ..
-> $root/var/adm/logs/1-busybox.out -> 1-busybox.err
== 01/15/08 10:36:55 =[1]=> Aborted building package busybox.
-> Unmounting loop mounts ...

This problem is not only with embedded target, it is also with generic system.