bash-2.05a$ pwd
/usr/lib/tk8.3/demos

bash-2.05a$ rpm -qf widget
tk-8.3.3-69
bash-2.05a$

bash-2.05a$ ./browse
./browse: exec: wish8.3: not found

bash-2.05a$ grep 'wish8.3' *
browse:exec wish8.3 "$0" "$@"
hello:exec wish8.3 "$0" "$@"
hello~:exec wish8.3 "$0" "$@"
ixset:exec wish8.3 "$0" "$@"
rmt:exec wish8.3 "$0" "$@"
rolodex:exec wish8.3 "$0" "$@"
square:exec wish8.3 "$0" "$@"
tcolor:exec wish8.3 "$0" "$@"
timer:exec wish8.3 "$0" "$@"
widget:exec wish8.3 "$0" "$@"

====================================================

The internal 'exec' of the demo program set calls a 'versioned' variant of
'wish' -- and needs a awk fixup of the entry wish8.3 to /usr/bin./wish

During the build it can be as simple as the fix used elsewhere in the .spec
file:

...
cd ${RPM_BUILD_ROOT}
cd ./usr/lib/tk%{tclvers}/demos
	for i in `ls `; do
        sed "s|wish%{tclvers}|wish|" < $i > $i.new
	mv  $i.new $i
done
...