I think the command you're missing between ./configure and make install (or uninstall) is make. Also, you need to run those commands from inside the unix folder in the tcl source. And another thing, I think with tcl you need to keep the source after you've compiled it (I'm not sure why, that's what it says in the Linux From Scratch
book and I believe them) so if I were you I would untar the tcl source somewhere where you won't notice it hanging around. /usr/lib perhaps?