I got this solved. Turned out to be the simplest of things, in
retrospect. Andras had it right as to being a 64 v. 32 bit
issue. On trying to compile KMyMoney, I ran into the exact same
error, which led me on a succession of trial, error, and Googling
(introducing me, along the way, to the wonderful world of multiarch
issues), leading to, for the record:
./configure --libdir=/usr/lib64
This being the first x86_64 system I've had, this simply had never entered my head.
But all is fine now. There were no problems at all,
unsurprisingly, with make and make install. A quick download and
compile of Tidy as suggested when I first ran Quanta, and I'm on my
way. The input from both of you helped me on the right path;
thanks again!
Terrific software, by the way.
Chris