It shouldn't be placed in /usr/local/thot/bin/thot but in
/usr/local/bin/thot. before extracting the new version you should
remove the old link /usr/local/bin/thot pointing to
/usr/local/thot/bin/thot. What appened is that tar first extracted a new
and correct version of /usr/local/thot/bin/thot and tried to install
later the /usr/local/bin/thot script. Unfortunately tar followed the
link and overwrote /usr/local/thot/bin/thot.
Just "rm /usr/local/bin/thot" and reextract the tar distribution, this would
be fine ... I think you are not the first one to had this problem.
BTW, I have placed a correct version of the /usr/local/thot/bin/thot
script in ftp://opera.inrialpes.fr/pub/patch/thot in case you removed the
original tar file.
hope this help,