well since your using slackware, just download the slackware package
and then type as root :
just to answer your question though when compiling ...
you untar the *.tar.gz file by typing ...
tar -zxvf tvtime-0.9.12-i686.tar.gz
then go into the directory and type :
./configure && make
and then install it :
su -c "make install"
type root password