New issue by frmoronari on void-packages repository

https://github.com/void-linux/void-packages/issues/23808

Description:
<!-- Don't request update of package. We have a script for that. https://alpha.de.repo.voidlinux.org/void-updates/void-updates.txt . However, a quality pull request may help. -->
### System
https://alpha.de.repo.voidlinux.org/live/20200722/void-live-x86_64-5.7.10_1-20200722.iso
### Expected behavior
open void-installer on type "void-installer" after ISO boot.
### Actual behavior
received a messagem "ERROR: missing dialog command, exiting . . . "
### Steps to reproduce the behavior
make a usb with a ISO image. boot from USB or
boot from ISO file with qemu/kvm.
type user (root) and password for login.
type void-installer on shell.