check if libpcap has PCAP_ERROR_IFACE_NOT_UP
authorMarc Fournier <marc.fournier@camptocamp.com>
Fri, 9 Aug 2013 12:53:24 +0000 (14:53 +0200)
committerMarc Fournier <marc.fournier@camptocamp.com>
Fri, 9 Aug 2013 12:53:24 +0000 (14:53 +0200)
This should prevent DNS plugin from being built on systems with libpcap
older than 1.0.0.

GitHub issue #373


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