Build rootfs from lichee

Azmath Moosa
Hi, I have the lichee source tree and i successfully build Kernel and
uboot.  I got myself a debian rootfs and was working fine.

But for my application i needed a tiny rootfs so i used a custom buildroot
to build the rootfs.  I managed to boot into it with the lichee kernel and
everything worked except an alsa driver that complains about library
version mismatch.  It is caused because the toolchains used to build rootfs
and the kernel are different.

How do I build rootfs using the lichee SDK?  Or is there an option to
install sunxi toolchain in my custom buildroot (external toolchain)?  Can
anyone guide me with this?