post_install() {
    cat << EOF
==> Install linux-user-ns-enabled kernel from AUR if you're using default without USER_NS_ENABLED option (can be checked with # zgrep CONFIG_USER_NS /proc/config.gz)
==> Probably you need to set up /etc/subuid /etc/subgid files
==> More info how to get Vagga to work see here: http://vagga.readthedocs.org/en/latest/installation.html
EOF
}