It seems an error in Net-Pcap-0.14 since I tried Net-Pcap-0.16 and that error is gone. While performing tests as root (needed for several of them), I even got unexpected successful results with 0.16:

All tests successful (9 subtests UNEXPECTEDLY SUCCEEDED), 9 tests and 
+93 subtests skipped.
Files=30, Tests=1609, 315 wallclock secs ( 1.07 cusr +  0.15 csys =  1
+.22 CPU)
[download]

Please, note that some tests take quite time to finish, hence the 315 wallclock secs.