perl-Net-Pcap-0.18-1.fc26 fails to build in F26 because a test fails: t/08-filter.t .............. ok # Failed test ' - $err must not be null: syntax error in filter expression: syntax error' # at t/09-error.t line 25. # 'syntax error in filter expression: syntax error' # doesn't match '/^(?:parse|syntax) error$/' # Looks like you failed 1 test of 10. t/09-error.t ............... Dubious, test returned 1 (wstat 256, 0x100) Failed 1/10 subtests This is cause by upgrading libpcap from 14:1.7.4-2.fc24 to 14:1.8.0-1.fc26. It looks like libpcap changed the error message wording.