install perl/Tk on mac.

http://www.lehigh.edu/~sol0/Macintosh/X/ptk/

You can use the Perl 5.8.6 that comes with Tiger or build it yourself. Now fetch the Perl/Tk distribution, (Tk-804.027) . Unpack Perl/Tk and build it using the standard idiom:
tar -zxvpf Tk-804.027.tar.gz
cd Tk-804.027
perl Makefile.PL
make
make test
sudo make install
Helpful comments from others on my install instructions here.