--- Begin Message ---
What happens if you put
printf("Version: %s\n", pcap_lib_version());
before the pcap_lookupdev() call?
It won't fix the pcap_lookupdev() call not to return NULL, but it'll indicate
what version of libpcap your program is using, which might help determine what
the problem is. Let us know what the "Version:" output is.
--- End Message ---
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