Don't.
GetOptions(
'--one' => \$one,
'--two' => \$two,
'--three' => \$three,
);
die "Only one of options --one, --two and --three are allowed\n"
if ( grep defined, $one, $two, $three ) > 1;
or
GetOptions(
'--one' => \$opts{one},
'--two' => \$opts{two},
'--three' => \$opts{tree},
);
die "Only one of options @{[ sort keys %opts ]} are allowed\n"
if ( grep defined, values(%opts) ) > 1;
Update: Updated since I hadn't properly read the question initially.
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