>perl -d:ptkdb 777.pl

Can't locate Tk.pm in @INC (@INC contains: C:/Perl/site/lib C:/Perl/lib .) at C:
/Perl/site/lib/Devel/ptkdb.pm line 35.
BEGIN failed--compilation aborted at C:/Perl/site/lib/Devel/ptkdb.pm line 35.
Compilation failed in require.
BEGIN failed--compilation aborted.