Now I see, there is a 1.0.2 binary for Linux on AMD 64. And a
1.0.3 package that turns out to be a binary for Linux, too.
(Should have been obvious by the .tgz filename extension.)

Looks like this is for a BSD distribution called "Dragonfly".
I thought "Dragonfly" was a release label. So this doesn't work
on Linux.

I'm going to give it a try when I get back to my Linux machine
next week.

There is no version of Gestalt >= 1.0.2, which has the
gexslt:response-body(), neither for Windows nor for Linux
on i386.