A Question about a supposedly missing file

["Stephen P. Molnar" <s.molnar@sbcglobal.net>]

I have installed a GUI for some of my modeling programs 
(http://www.quimica.urv.cat/~pujadas/BDT) on my Debian Stretch platform.

While there were no warning or error messages during the installation 
when I attempt execution I get the following:

comp@AbNormal:~/Apps/BDT$ ./bdt
/usr/local/gromacs/lib:/opt/mopac
./bdt.exec: error while loading shared libraries: libtcl8.4.so.0: cannot 
open shared object file: No such file or directory
comp@AbNormal:~/Apps/BDT$

The supposedly missing file is in 
/home/comp/Apps/BDT/tools/tcl-tk8.4/lib.  How do I go about solving this 
problem?

Please advise.

Thanks in advance.

--
Stephen P. Molnar, Ph.D.
Consultant
www.molecular-modeling.net
(614)312-7528 (c)
Skype: smolnar1