Those warnings above are not errors; they just warn you that some functionality may not be added. If you run make test after make and all tests are successful, then everything should be fine. You can see that the Makefile targets were actually made:
chmod 755 blib/arch/auto/Net/Pcap/Pcap.so
cp Pcap.bs blib/arch/auto/Net/Pcap/Pcap.bs
chmod 644 blib/arch/auto/Net/Pcap/Pcap.bs
cp bin/pcapinfo blib/script/pcapinfo
/usr/bin/perl "-MExtUtils::MY" -e "MY->fixin(shift)" blib/script/pcapi
BTW, there's no need to sudo make unless you need to install the Makefile targets, i.e. sudo make install.