Worked fine on my system. I'm running 5.6.0 on AIX. Now, a suggestion:

open(OUTFILE, ">$logfile") || die "Cannot open '$logfile' for writing:
+ $!\n";
[download]

That will tell you why it cannot open the file. (That's what the $! variable does.) You should always check the return value of open and similar functions.

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We are the carpenters and bricklayers of the Information Age.

The idea is a little like C++ templates, except not quite so brain-meltingly complicated. -- TheDamian, Exegesis 6

Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.