Use a ref to that sub, not a string:
$SIG{INT} = \&cleanup;
Update:
Oh, Win32. Check this out, at the bottom:
Perl Quirks on Win32
Looks like signal handling and Win32 is a bad mix.
Update, again:
Well, I am an idiot. My first suggestion (use a ref) is somewhat pointless, as the string construction should work fine, subject to the Win32 issues noted above (although the perlipc page suggests the best way is to use a ref).
Apologies...
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