sauoq and webfiend give you what's usually the best answer, to make the variable lexical with my.

Other ways are our $counter; which produces a scoped global, use vars '$counter'; which adds its argument list to the current namespace, or always referring to $counter as $main::counter (perhaps) which is the literal cure to the strict complaint, but awkward.

After Compline,
Zaxo

In reply to Re: Error msg "requires explicit package name" by Zaxo
in thread Error msg "requires explicit package name" by Theo

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