I wasn't sure where to put this. I just downloaded the RPM (spectcl-1.2.1-2.noarch.rpm). In specTcl, the DIR is set to /usr/share/SpecTcl. When run, it can't find main.tk. Changing it to /usr/share/SpecTcl/SpecTcl corrects it.
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I second this bug report. It doesn't make sense to bundle all the tck/tk scripts in /usr/share/SpecTcl/SpecTcl, but then put the location /usr/share/SpecTcl in the specTcl script. Yes, the DIR value can always be changed, but why not start with a script that points to the correct DIR at installation?