In short: Strict and warnings add a lot of compile time checks to help you catch "potential" problems.
This usually works well if you don't try to tweak the normal procedures like you do by switching to runtime effects.
Either ignore or disable these messages or start to read what Perl really does. ;)
Hint:
Perl 5 is mostly compatible to Perl 4 which didn't have strict ...
edit
... and does dynamic binding of vars and subs unlike C.
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