Dave
Two notes that are antiX specific:
Xinitrc is not used in default antiX configuration. So relying on it will error out / be debian default package config with no extras.
Second, startx defaults to .xinitrc which as previously stated is not used by default in antiX. Instead try something like
startx /usr/local/bin/desktop-session rox-icewm (or space-icewm, icewm, space-fluxbox etc)
Computers are like air conditioners. They work fine until you start opening Windows. ~Author Unknown