Setting exact dependency of ruby-pcap Version 0.7.9 doesn't seem to play well with mctop.  The code may need to be refactored for the newer version, but 0.7.8 still works like a champ.
Setting exact dependency of ruby-pcap
Version 0.7.9 doesn't seem to play well with mctop.  The code may
need to be refactored for the newer version, but 0.7.8 still works
like a champ.

etsy/mctop