How to install apt-get on a busybox embedded system?

view story

http://serverfault.com – My embedded system is for sh4 CPU. The debian distribution may get on http://www.si-linux.co.jp/pub/debian-sh/lenny-sh4/ I get the apt*.deb and extract the data.tar.gz. After setup the /etc/apt/sources.list, I could do 'apt-get update'. But it missing dependency when I try to run 'apt-get install ntpdate'. Is there any method to let apt-get ignore some base packages? Because those package is build by my original embedded system.(eg. busybox). (HowTos)