icecat 3.0.4 floating point exception on debian 4.0

[Karl Berry]

I tried the new icecat 3.0.4 i386 binary on my Debian 4.0 system (that's
what /etc/issue says, I don't know the code name; the kernel is
2.6.18-6-686).

When I run the icecat script, I get:
./run-icecat.sh: line 131:  3696 Floating point exception"$prog" ${1+"$@"}

Running the script with sh -vx did not show anything interesting.
I have no ~/.gnuzilla directory or previous installation of icecat on
this machine.  The "update manager" reports that the system is up to
date.

I see many reports of the same thing on the web (with mozilla and
firefox -- I'm sure this is not specific to icecat), but no meaningful
answers or useful ways to debug.  Puzzling.

karl