How do I find out what plugins my current VM was built with?  This is
about an already built VM, not VMMaker.

The closest I have found is
SmalltalkImage current listBuiltinModules
and listLoadedModules.
I believe that external, unloaded modules will not appear in either.

I'm trying to figure out if I'm setup so I can use some of the font
packages.  I'm running a 3.10 image (but 3.9 VM) on Linux (Debian
Lenny).

How do I get a list of all plugins?