... the error "Can't use global $1 in "my""

What is the specific code that produces this error? If you don't show us the code, we can only make more or less wild quesses. This just wastes our time and yours. Please see How do I post a question effectively? and How (Not) To Ask A Question.

Update: BTW: I ran the code eyepopslikeamosquito posted here under Perl 5.8.9 and I get the advertised output with no errors or warnings.