Because we create a chroot to build a liveCD, any Linux distro from Gentoo to Debian can work on Cherimoya. All you need to do is to install the package manager to your host system.

Gentoo has a package ready to go. Just unmask and emerge it:

# echo sys-apps/pacman >> /etc/portage/package.keywords

# emerge -va sys-apps/pacman

Because Gentoo does not have libfetch, you will need to uncomment one of the two XferCommand lines in /etc/pacman.conf. I recommend using the wget line:

XferCommand = /usr/bin/wget --passive-ftp -c -O %o %u

For other distros, such as Debian or Fedora, they either do not have a Pacman package, or it is too old. Not to worry though, just download this script, run it, and pacman will be installed.