Add this to see what's going on: 
use Data::Dumper;
print Dumper $o;

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And you'll see that the key 'h' _is_ being created, and the value is undef, which is why your if statements don't pick it up, since it's a false value. This will do what you want: 
usage() if exists $o->{h};

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In reply to Re: getopt::std help by davidrw
in thread getopt::std help by convenientstore

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