I'm encountering same issue in MAC OS x 10.9. 
'libpcap version 1.3.0 - Apple version 41'

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Somewhere in online they have mentioned MAC OS has pre-installed Perl modules in 
~/Library/Perl

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In reply to Re^2: Not able to install Net::Pcap in MAC OS Mavericks by waytoperl
in thread Not able to install Net::Pcap in MAC OS Mavericks by waytoperl

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