your missing the perl/tk module, or more precisely, it hasn't been part of the default perl install for a while.
try installing the module through CPAN:
cpan -i Tk
you might need to run that as root:
sudo cpan -i Tk
That might not work though- CPAN sometimes has issues and reports errors, in that case, you can do it the "hard" way:
download the archive straight from CPAN:
http://search.cpan.org/CPAN/authors/id/S/SR/SREZIC/Tk-804.028.tar.gzExtract/untar and enter the directory, and run the following:
perl Makefile.PL
make
make test
make install