Broken TeXmacs interface with 5.9.3 in Debian sid.

Hi all.

During a perhaps rash "aptitude dist-upgrade" in my Debian box, I
updated to the development version 5.9.3 of Maxima that is currently
in Debian's unstable branch, replacing the previous release, whatever
number it may have been, which mysteriously doesn't seem to have been
moved to the testing branch (I use a mixed testing/unstable system,
with testing preferred).

This has had the result that now my TeXmacs interface is borked:
"Unsupported version of maxima: 5.9.3". And it truly doesn't work; any
attempt to get TeXmacs to generate Maxima output simply hangs forever,
and I have to xkill TeXmacs. :-( TeXmacs is also the latest version
fron Debian unstable, so updating it seems out of the question.

Any fixes, preferrably Debian-style? I would prefer to not circumvent
APT, since package management tends to get messier when you do.
However, if you do have another fix which may not be Debiany, I'm open
to it.

Thanks,
- Jordi G. H.