[gambit-list] How to ue a module?

I just made bootstrap from the 4.6.1 development sources, which I downloaded using git.

When I start gsi and, according to the section "Subdivide code into modules" in the tour of Scheme in Gambit, I use "use" it tells me

hendrik@notlookedfor:~/dv/lang/gambit/gambit$ gsi/gsi Gambit v4.6.1

(use ssax-sxml)

*** ERROR IN (console)@1.2 -- Unbound variable: use 1>

So evidently something is still missing, unconfigured, unbuilt, or whatever. It doesn't even get around to looking for the library -- which is another question: how does it find the libraries, assuming it gets that far. And if the X module system is itself a module, how do I bootstrap it into the system?

Or should I be using an entirely different mechanism?

-- hendrik