The host pacs1 runs SuSE 9.3. The TCL package of this distribution does not contain the "threads" extension. Therefore TCL/TK must be reinstalled from their source packages.

Required source tar balls:

Installing TCL

tar -xzf tcl8.4.11-src.tar.gz
cd tcl8.4.11/unix
./configure --enable-threads -enable-shared --enable-man-symlinks --prefix=/usr
make 
make test
su -c "/usr/bin/make install"