Couldn't find package libc6-arm-cross ?

[sniperpr]

sudo chroot /other/debwrt/debwrt/build/debian-kirkwood-Default-lenny bash
 -c "export LC_ALL=C; apt-get -y --force-yes install libc6-arm-cross libc6
 -dev-arm-cross binutils-arm-linux-gnu gcc-4.3-arm-linux-gnu g++-4.3-arm-
 linux-gnu linux-kernel-headers-arm-cross"
 Reading package lists... Done
 Building dependency tree
 Reading state information... Done
 E: Couldn't find package libc6-arm-cross
 make: *** [debian/buildenv/emdebian-prepare] error 100