or download this
C:\strawberry\cpan\build\Net-Pcap-0.16-A9_0Y2>perl Makefile.PL INC=-IC
+:/WpdPack/
Include "LIBS=-LC:/WpdPack/Lib -lwpcap"
...
checking for pcap_lib_version() in -lwpcap... yes
detecting available functions... ok
Writing Makefile for Net::Pcap